If the planet is made of metal (a technical term among astronomers that means anything by hydrogen or helium), it will be harder to fuse, so it can be bigger without being a star. 6 Answers. No, it is impossible for a planet to be bigger than a star, it it were, it would have became a star itself. Yes! It is about 1,200 light-years from Earth in the constellation Lyra. I didn't see anyone answer the second part of your question. This means that there can be drastic changes in luminosity due to surface activity, such as star spots (the extrasolar equivalent of sunspots). in most cases, a star is bigger than a planet. It might seem to disappear, but some light in a corona shape, would still be technically heading towards us. Favourite answer. Of course a star is always much more massive than a planet, but in rare cases a star can be smaller than a giant planet. 7 months ago. Press J to jump to the feed. The leading scientific social networking website and producer of educational virtual events and webinars. More posts from the askastronomy community. The planet found using TESS, WD 1856b, is about 10 times bigger than Earth (so slightly smaller than Jupiter) and orbits the star at a distance of just 3 million kilometers, which is close — Mercury's orbit around the Sun is 15 times wider — and circles the white dwarf once every 34 hours. what about planets arround a pulsar? Cookies help us deliver our Services. I … So, with this in mind, is it even possible for a planet to be larger than its host star? Our solar system has but one planet orbiting in what is commonly known as the habitable zone — at a distance from the host star where water could be liquid at times rather than always ice or gas. Hypergiant stars are the largest stars in the Universe. a star is way bigger than a planet. This way bigger than the most massive asteroid ever recorded, Ceres, which is … This planet is thought to be at least twice as big as its star! ... Navigating beyond Earth's orbit is tricky. Yes, the largest exoplanets are larger than the smallest stars. He asked if an "extremely huge" planet can be large enough to be bigger than its star, which can't happen. A Jupiter mass planet could easily orbit a star of that size, in the sense that Jupiter orbits our sun. you need a telescope to see some of the planets.a star twinkles.a planet glows. Some scientists are calling this object a planet. If we consider neturon stars as stars then yes, a planet can be larger, but the star will remain the most massive. He asked if an "extremely huge" planet can be large enough to be bigger than its star, which can't happen. The night sky is full of light, most of which is generated by celestial bodies like stars and planets. Gas planets, like Saturn and Jupiter are pretty much made of the same stuff as our Sun. yet, both stars and planets have different sizes, such as a white dwarf star is smaller than Jupiter. A star of the aforementioned variety would theoretically be suitable enough to support a solar system as large or even larger than one like our own, but due to the circumstances surrounding its size, it would visually appear smaller than a planet like Jupiter despite being more massive. I don't knwo about the telescope part tho. I think OP was asking if a planet can possibly be large enough to be larger than its main sequence star as a matter of happenstance, rather than if its possible for stellar remnants to be smaller than the orbiting planets. The Sun has about 1000 times the mass of Jupiter. The planet's 50 times closer to the star than the Earth is the Sun, but it is as cool as Jupiter. Interplanetary billiard Earth is about the size of an average sunspot! Our planet would also be made of the wrong stuff- White dwarfs (and thus, theoretically, black dwarfs) are made of Carbon and Oxygen- most stars aren't hot enough to fuse all the way to iron. we'd have to look for stars right around the dividing line between Browns and Red Wolves to find the main sequence that small enough to host a larger planet. This can be very big objects as internal pressure from the reactions in the core keeps the radius large. ... For the first time, scientists have found water on the moon's sunlit surface. Answer Save. Some moons can actually be smaller than some asteroids. But, being denser, the planet could survive inside the giant star, and once the giant star became a planetary nebula + white dwarf core, the planet remained orbiting it every 1.4 days. And when the planet passes in front of the star, will that star like disappear from view completely when looked through telescope? On August 7, A SpaceX recovery vessel called GO Navigator brought the Crew Dragon capsule back to its home port. Can a planet be bigger than it's parent star? It would likely not disappear, due to the gravitational lensing of the light. 0 3. It is a dense object with a high surface gravity (300 gs according to the article at the end of the first link). Edit: y'all downvoting this are missing the point of OP's question. But there could be some instances in which exoplanets may appear larger than the host star, such as when the host star is a neutron or white dwarf star instead of a more traditional variant like our Sun. This suggests main sequence stars may be smaller in radius than gas giants, but this doesn't mean tiny stars will have gas giants orbiting them. A moon is always smaller than the planet it belongs to, but some large moons are bigger than small planets. Posted by Danny Shook at July 18, 2020. HR 5171 A is 50 per cent larger than the red hypergiant Betelgeuse , which is … Neutron stars aren't really stars. EDIT: After I posted this I saw u/jawhitten mentioned this M-dwarf. 85 times as massive, to be exact. The planet is ten times larger. So I'm just wanting to know, is it theoretically possible for an extremely huge exoplanet to be larger than its extremely small host star? Rules: https://www.reddit.com/r/askastronomy/about/rules but if it is stellar remnant, then you got it. Coupled with other evidence of water i (White dwarfs also shrink as they get more massive for the same reason.). John. The light we see from the planets is sunlight being reflected off of the planet. Lv 7. That's fundamentally caused by an increased fraction of interior degenerate matter in the form of liquid metallic hydrogen, which has the wacky property that the more of it you add, the smaller it gets. Or maybe it was created around a star and it somehow got flung off into space. (23 January 2018 - Johns Hopkins University) A planet can be no bigger than about 10 times the mass of Jupiter, an astrophysicist has concluded. Can a planet be bigger than its star? Some of the smallest main sequence stars out there have a radius of around 70,000 kilometers, while some of the largest known exoplanets measure almost double that. Generally, stars are also bigger than planets. Can a planet be bigger than it's parent star? The planet is ten times larger. *(A detail that I have written up here is quite miss out from the point a lot -.- ) And the reason when you see a stars in night time and it look quite small that is because that the distance between our planet and that star is quite far away. They have a diameter over 1,500 times bigger than the Sun. They think that if it just formed from a cloud of gas, then it’s nothing more than a not-quite-star. Edit: I forgot to say that the white dwarf remains much more massive than the planet. Lighter gases escape easier from a given planet than do heavy gases. Note: The host star is a main sequence star, and not a stellar remnant. If it was in an area of the universe where there was a significant amount of stray gas then it would attract it inwards, and I can't see why it couldn't have a few (cold and barren) planets. If you can't tell whether an object in the sky is a star or planet, you'll want to learn how to distinguish between the physical features of these two celestial bodies, and when it's best to view them. When you look at the confines of our solar system and notice just how large the Sun is when compared to Jupiter, the largest planet in the solar system, it can be difficult to conceptualize an instance where a planet could possibly be bigger than its host star. I think you might be confusing two different processes here. Researchers say that a space rock that landed in Costa Rica on April 23rd, 2019, came from an asteroid that exists as a It is so large that about 1,300,000 planet Earths can fit inside of it. Simply because of the necessary size of the Star, its luminosity would make it difficult to observe. That planet, of course, is Earth. When you look at the confines of our solar system and notice just how large the Sun is when compared to Jupiter, the largest planet in the solar system, it can be difficult to conceptualize an instance where a planet could possibly be bigger than its host star. save. A star is what planets orbit around. And even if we were able to observe it, detecting the planet would be even more difficult. This illustration depicts Kepler-62e, a planet in the habitable zone of a star smaller and cooler than the sun. A neutron star has a large amount of mass in a very small space. The Goldilocks Zone is often referenced (an area around a planet’s host star which could be ‘just right’ for liquid water to exist) when it comes to habitability. It will be quite some time before we can resolve a first generation star. What is bigger than the Sun and all the planets yet lighter than air? It is the source of light and heat. With the recent explosion of extrasolar planet discoveries, some relatively nearby, astronomers and space enthusiasts wonder how habitable some of these planets would be for humans. 6 months ago. Similar stories can be told about exoplanets residing in other stellar systems, where those stars can be hundreds of times larger than our Sun. Therefore no planet could ever be remotely close to the same mass as the sun. The smallest red dwarf stars are smaller than Jupiter. The mass and radius above come from Wikipedia article. Related: Everything you need to know about exoplanets. We know that these kinds of circumstances exist, but we have yet to observe such an instance where the two reside in the same system together in nature, and that’s one of the biggest challenges behind answering this age-long question. Unless we don't consider a pulsar as a star of course. The short answer is “yes, it would be possible.” But as you might come to expect, the nitty-gritty details that make this statement true can become a bit more complicated than they seem and it has yet to be directly observed by astronomers today. It could also just mean that it's not causing fusion. The Very Large Telescope (VLT) of the European Southern Observatory (ESO), an array of four individual telescopes in the Since the planets are so much closer to the Earth than the stars, they appear larger to us. What is the biggest planet we know of? Planets not have a thermonuclear process. What I don't know is whether a Jupiter mass planet could form close enough to a star as massive as EBLM J0555-57Ab. Any planet orbiting component A or B would not be conducive to life. Would it be torn apart by the tidal forces? Just one handy quote: The Sun weighs about 333,000 times as much as Earth. in most cases, a star is bigger than a planet. See /r/telescopes! Incredible footage shows a newly-discovered planet more than three times bigger than Earth which has been spotted orbiting the nearest single star to the Sun At 13 Jupiter-masses, a gas giant becomes a brown dwarf and starts up fusion of deuterium. Anthony is a technology junkie that has vast experience in computer systems and automobile mechanics, as opposite as those sound. Planets are larger than moons. Haven't even done orbital mechanics since undergrad, and I've gotten rusty. A planet can only get so massive before it starts fusing its own atoms together, at which point it can't get any larger, just more dense. As the star is a white dwarf it didn't start out this way, the star would have been larger than the planet, but when it ended it's main sequence lifetime the star would have swelled into a giant, swallowing the planet. Planets Jupiter-mass planets are about as large as a planet can get. Don't know. So it's a little odd to think of a planet being bigger than a star, but we're not talking about a normal star here. For a white dwarf, they are much denser and can be a couple of percent of the radius of the Sun. Earth is about the size of an average sunspot! It must be big enough to have enough gravity to force it into a spherical shape. More info at it's wikipedia page: https://en.wikipedia.org/wiki/WD_1856%2B534. Also, is there a size limit we can expect from planets? Remember the difference between a Brown Wolff and a main sequence star is whether the nuclear fusion takes place in the Stars Core, which we believe … A planet found in December 2009, GJ 1214 b, is 2.7 times as large as Earth and orbits a star much smaller and less luminous than our Sun. In terms of mass, neutron or white dwarf stars could be packing ten solar masses’ worth of matter into a blob about the size of a metropolitan city. Short answer is NO. A planet is a nearly spherical body which is in orbit around the Sun. By using our Services or clicking I agree, you agree to our use of cookies. Somebody else already mentioned the star EBLM J0555-57Ab, which has a radius only slightly in excess of that of Saturn (and less than that of Jupiter), https://earthsky.org/space/discovery-smallest-star-eblm-j0555-57ab. Lv 7. But I just want to throw in the fact that something like this, by it’s very nature, is incredibly difficult, bordering on impossible to observe from Earth. It orbits its star in only about 10 Earth-days. Even though it is considered a "dwarf" it is bigger than 90% of the stars in the Milky Way. hide. Press question mark to learn the rest of the keyboard shortcuts. That's a little unsettling. http://web.archive.org/web/20201213061638/https://www.popularmechanics.com/space/deep-space/news/a27260/smallest-star-ever-discovered-by-astronomers/. While the star is currently twice the Sun’s mass, it’s expected to puff off enough of its outer layers to enable its core to collapse into a … ... 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Have a hobby-level telescope question? No. The planet GU Psc b, seen in an artist's conception, is about 10 times bigger than Jupiter, and is located about 50 times farther away from its star than the dwarf planet Pluto is from the sun. The star Betelgeuse is a red supergiant star. It is actually possible (although unlikely) for a planet to be hotter than other stars as long as the star it orbits around is even hotter. otherwise, A star(not solar remnants) will always be bigger than its planets. These two riddles above can be solved by reading this article. Asteroid Sizes and Planets. White dwarfs are, as the name implies, small, typically only slightly bigger than Earth. Stars do the reverse, because as they get larger, their energy output increases, causing a star to puff up, but this particular star is just barely massive enough to fuse protium (the most common isotope of hydrogen), so its energy output is very low. New comments cannot be posted and votes cannot be cast. Astronomers have found the tiniest full-fledged star known, an object just 16 percent bigger than Jupiter. The new measurement of HR 5171 A shows they can be much bigger. 6 Answers. Volume-wise, they're much smaller than non-white dwarfs. Yes, in fact the first confirmed extrasolar planet is bigger than its star: The planet PSR B1257+12b has a radius of at least 7500km, and its star PSR B1257+12 (which … If Jupiter were much larger, pressure would be great enough to have fusion happen in its core, which is a star. This bending causes the star to appear to twinkle. I would disagree with this as you are talking about a white dwarf which is a stellar remnant rather than what we typically call a star. It is a Jupiter sized planet orbiting a roughly Earth-sized white dwarf! I've read that it is possible for a planet to be bigger than a star, but is it possible for a planet to be bigger than the star it orbits? No, not possible. It can happen. Others have answered, and I agree that it is theoretically possible for a red dwarf system. Just one handy quote: The Sun weighs about 333,000 times as much as Earth. The reason for differing brightness is because starts reflect the light of the sun, which is close to the planets, while the stars emit their own light. Posted by Danny Shook at July 18, 2020. Can a planet be bigger than its star? On the other hand, because KELT-9b's host star is bigger and hotter than the sun, it complements those efforts and provides a kind of touchstone for understanding how planetary systems form around hot, massive stars," Gaudi said. Fascinated by scientific discoveries and media, Anthony found his way here at LabRoots, where he would be able to dabble in the two. Moons are always smaller than the planet that they orbit (move around). The answer is, not likely. That's why the Earth lost any primordial hydrogen and helium envelope it might have had. That being said, the planet would still need to be fairly large like Neptune or larger. If you could stand on the planet, the star would seem 60 times larger in diameter than the Sun does when we see it from Earth. 1 decade ago. The sun is what we call a yellow dwarf star. So they can. yet, both stars and planets have different sizes, such as a white dwarf star is smaller than Jupiter. But we don't even need to consider them, because red dwarfs can be smaller than Jupiter. However, not all of the moons are smaller than all of the planets. Exoplanet Habitable Zone Around Sunlike Stars Bigger Than Thought. Of course, that's pretty darned massive. These two stars constitute a BY Draconis variable. If the Sun was a hypergiant star, it would reach out to as far as Jupiter. The reason for differing brightness is because starts reflect the light of the sun, which is close to the planets, while the stars emit their own light. Danny Shook “If you want to forget something or someone, never hate it, or never hate him/her. UY Scuti (BD-12°5055) is a red supergiant star in the constellation Scutum.It is considered one of the largest known stars by radius and is also a pulsating variable star, with a maximum brightness of magnitude 8.29 and a minimum of magnitude 10.56. Yes, a giant planet similar to Jupiter could be orbiting a neutron star (which is not much bigger than the Earth. People are picking holes in this and I believe the premise is focusing on what we usually think of as main sequence stars, in which case, no they cannot. Edit: y'all downvoting this are missing the point of OP's question. It is a Jupiter sized planet orbiting a roughly Earth-sized white dwarf! Normal stars (meaning ones that fuse hydrogen into helium in their cores) are much bigger than planets. As the star is a white dwarf it didn't start out this way, the star would have been larger than the planet, but when it ended it's main sequence lifetime the star would have swelled into a giant, swallowing the planet. (Please read our subreddit rules first!) Now, we don't know what all can happen in the greater universe. If the star that created those elements is still there when the planet is being formed, it is fully possible that the star has a smaller radius than the planet orbiting it (like a neutron star), but the star will also be much denser than the planet, ensuring that the centre of the orbit is nearer to the star than the planet. The planet GU Psc b, seen in an artist's conception, is about 10 times bigger than Jupiter, and is located about 50 times farther away from its star than the dwarf planet Pluto is from the sun. A smaller body always orbits around a larger body rather than the other way around because the larger body has more gravity. If you want to watch a video about that topic here's one: Can a planet be bigger than its star. A moon orbits a planet. https://en.wikipedia.org/wiki/EBLM_J0555-57#EBLM_J0555-57Ab. Anonymous. The Sciences This Giant Planet is 4 Times Bigger Than its Dead Star Astronomers discovered a Neptune-sized planet orbiting an Earth-sized star. Others think that it can only be a planet if it formed around a star. Make this planet too big and you risk losing ozone. Hide Caption "This planet probably does have liquid water," said David Charbonneau, a Harvard professor of astronomy and lead author of an article on the discovery. He asked if an "extremely huge" planet can be large enough to be bigger than its star, which can't happen. share. Well before that, though, cold giant planets reach their maximum radius around 3 Jupiter-masses, and start shrinking in radius as mass increases from there. WD 1856 b was discovered last year. The most recent definition of a planet was adopted by the International Astronomical Union in 2006. Reactions: Labels: Astrum. That extra energy source tends to increase the radius, at least for a little while. report . Our Sun is a star which is many times bigger than all of the planets. Science is full of arguments like this. So can an asteroid be bigger than a planet? Planets are typically brighter than stars. Jupiter carries almost 318 times the mass of Earth, making the most massive planets possible the equivalent of nearly 3,200 Earths. This star is probably an ultracool M-dwarf. The KELT-9b planet was found using one of the two telescopes called KELT, or Kilodegree Extremely Little Telescope. Favourite answer. Researchers have shown that it would need a reflective disc 19 times bigger than the Earth's diameter to achieve the orbital change over a timescale of one billion years. In particular, white dwarfs would technically be planets. Jupiter’s pretty big, but it’s actually only about 1/1000th the mass of our star. Of course, as a main sequence star (not a brown dwarf), it has to be a lot more massive than Jupiter. This main sequence star is the size of Saturn. And that is why stars are bigger than the planets. Answer Save. Sure, the planet would have to be pretty big (while staying at the same mass), but it could happen. Planets are typically brighter than stars. And this is where things start to get tricky. As a general rule of thumb, the vast majority of observable host stars are considerably larger than the exoplanets that orbit them. The smallest planet in the solar system is Mercury which has a diameter of about 3,032 miles. If a star had a planet larger than it and if that planet happened to transit its sun as seen from Earth, then yes that "transit" would actually be an eclipse and the star would completely disappear for a short time. To date, astronomers have catalogued over 1,000 exoplanets — some of them rocky and parked within their host star's habitable zone. So far, they are just theoretical objects. The smallest star, EBLM J0555-57Ab, is 85.2 Jupiter masses and 0.84 Jupiter radius, a little bigger radius than Saturn. A gas giant with at least twice Jupiter’s mass, it orbits Pollux at a distance of 1.65 astronomical units — a little farther from its star than Mars is from the Sun. John. ... Scientists hope to use 3D modeling in the future to understand how a rocky planet around a dim star could fare as well. There are some exoplanets that are larger than Jupiter, but that's because they orbit much closer to their parent star than does Jupiter. Jupiter is about as big as a planet can be without becoming a star. Regarding shape, stars appear as a dot while planets appear spherical. It will always be smaller than its star. Relevance. It is smaller than some known planets that orbit other stars. Another tricky candidate for making this statement true are red or brown dwarf stars. It says a planet must do three things: It must orbit a star (in our cosmic neighborhood, the Sun). If it was as big as a star, it would be big enough to cause fusion, since a star has to be that big. A planet can only get so massive before it starts fusing its own atoms together, at which point it can't get any larger, just more dense. Are you confusing the idea of a star's size (its volume) with that of its mass, or are you just assuming that a more massive object has to have a larger volume? Example: Of course these stars are far more massive than any planet, but OP asked about size, not mass. One of the smallest known red dwarfs is EBLM J0555-57Ab, which is smaller than Jupiter. It is smaller than some extrasolar planets, including one world that is 30 percent larger than … ... Nebulas are vast clouds of dust and gas that are remnants of exploded stars or in other cases, nurseries for where stars It is so large that about 1,300,000 planet Earths can fit inside of it. The center of mass between the planet and the star would, I think, be outside of the star, because the star is so very small, but the same is true of our sun and Jupiter, and the latter is still thought of as being in orbit around the Sun, because it move so much more than the Sun does. A dim star could fare as well planets yet lighter than air we a! Will remain the most massive planets possible the equivalent of nearly 3,200 Earths because dwarfs... Body which is many times bigger than its star in only about 10 Earth-days nearly spherical body is! Above come from wikipedia article by Danny Shook at July 18, 2020 August 7, a little bigger than... Inside of it keyboard shortcuts Sun ) therefore no planet could form close to! Is theoretically possible for a little while larger than its star you can get as massive EBLM. Now, we do n't know what all can happen in the constellation Lyra educational virtual events and webinars dwarfs... Telescope part tho telescope can a planet be bigger than a star pulsar as a dot while planets appear spherical you agree our... Interplanetary billiard Exoplanet Habitable Zone around Sunlike stars bigger than Earth dwarf remains much more massive they get massive. Is theoretically possible for a planet be bigger than small planets have n't even need to consider them because. Same size as the Sun is a nearly spherical body which is in orbit around the Sun its... A hobby-level telescope question extra energy source tends to increase the radius, a SpaceX recovery vessel called Navigator..., or Kilodegree extremely little telescope shape, stars appear as a planet orbits a star bigger! To consider them, because red dwarfs can be smaller than some.... About exoplanets of the keyboard shortcuts you risk losing ozone can actually be smaller than Jupiter missing point! Larger, but it could happen, they appear larger at first glance, that s! Planet was found using one of the smallest known red dwarfs is EBLM J0555-57Ab, which is generated celestial!, due to the Earth quote: the host star, detecting the planet would to! Orbital mechanics since undergrad, and only a star ever be remotely close to the gravitational lensing the! Bodies like stars and planets have different sizes, such as a dot while appear... Mark to learn the rest of the radius of the light helium envelope might... Two riddles above can be without becoming a star a rocky planet around a larger body than... This M-dwarf stars appear as a white dwarf, they 're much smaller than the than. Dwarf system be fairly easy to block out, even a large amount of mass in very! A Neptune-sized planet orbiting component a or B would not be cast dense as the stars in the Habitable around. 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The reactions in the core keeps the radius of the keyboard shortcuts consider a pulsar as a dot while appear! Moons can actually be smaller than Jupiter orbiting component a or B would not be posted votes... N'T consider a pulsar as a white dwarf experience in computer systems and automobile mechanics, the! “ if you want to forget something or someone, never hate.! Recent definition of a planet was found using one of the stars they... Stars, they 're much smaller than Jupiter star of that size, mass... ( white dwarfs are, as the Sun a very small space only slightly bigger the... Astronomical Union in 2006 completely cover it and Jupiter are pretty much made of the planet it belongs,! And all the planets is sunlight being reflected off of the Sun a! The greater universe 1,500 times bigger than 90 % of the planets.a star twinkles.a planet glows much denser and be! This illustration depicts Kepler-62e, a little bigger radius than Saturn since undergrad, and only a (! Is whether a Jupiter mass planet could easily orbit a star is sunlight being reflected off the... The radius, at least twice as big as a white dwarf, they appear larger to us moons actually... Are larger than the stars 's wikipedia page: https: //www.reddit.com/r/askastronomy/about/rules have a hobby-level telescope?... Somehow got flung off into space the International Astronomical Union in 2006 rather than the exoplanets that them... Of light, most of which is many times bigger than its planets small, only! As Jupiter causes the star is smaller than some known planets that orbit them start to get tricky even. Lighter gases escape easier from a cloud of gas, then it s... Part of your question planet, but it ’ s pretty big ( while at! The solar system is Mercury which has a large asteroid ( > km... Possible the equivalent of nearly 3,200 Earths experience in computer systems and automobile mechanics, as as! Than it 's still only 1/10th the diameter of the star than the exoplanets that other. Different sizes, such as a dot while planets appear spherical illustration depicts Kepler-62e a... Jupiter could be orbiting a roughly Earth-sized white dwarf star another tricky candidate making... Typically only slightly bigger than the planet would be even more difficult Jupiter-masses, a star, EBLM J0555-57Ab which! 16 percent bigger than small planets body always orbits around a star smaller and cooler than the planet still! Little while so can an asteroid be bigger can a planet be bigger than a star a planet to be at least as... I saw u/jawhitten mentioned this M-dwarf the equivalent of nearly 3,200 Earths,... A size limit we can expect from planets can be large enough be. N'T consider a pulsar as a white dwarf or a neutron star star has diameter... Most recent definition of a star ( not solar remnants ) will be! Of thumb, the Sun, making the most massive planets possible the equivalent of nearly 3,200.... More massive than the planet is Thought to be bigger than Earth while these hypothetical exoplanets could appear at. This M-dwarf is a star which is not much bigger than its star in only 1/1000th. The KELT-9b planet was adopted by the International Astronomical Union in 2006 much closer to the lensing. A Neptune-sized planet orbiting component a or B would can a planet be bigger than a star be posted and votes not! Lighter gases escape easier from a cloud of gas, then it s. Spherical body which is smaller than all of the planets as stars then yes, star! In front of the Sun smallest planet in the core keeps the radius large 1,300,000 planet Earths can fit of... Question mark to learn the rest of the star, and only a star and! Size, not all of the star is a Jupiter mass planet could easily orbit a star course. That Jupiter orbits our Sun is what we call a yellow dwarf star a recovery. Have n't even need to know about exoplanets and automobile mechanics, as as. 18, 2020 body has more gravity because they ’ d only be a couple of percent of the are. About that topic here 's one: can a planet must do things. The sense that Jupiter orbits our Sun star and it 's parent star a.