Jupiter is mostly hydrogen and helium, with only a small fraction of any heavier elements. In our Solar System, there are two objects larger than this teeny star. Jupiter is the biggest planet in our solar system, but it isn’t massive enough to be a star. (NASA’s Goddard Space Flight Center / CI Laboratory) That is why Jupiter is sometimes called a failed star. That makes it the tiniest identified star to assist hydrogen fusion […] Jupiter is the largest planet in our solar system. One is the Sun, obviously. We love your photos and welcome your news tips. But it’s still unlikely that, left to the Solar System’s own devices, Jupiter would even become close to being a star. But it's still unlikely that, left to the Solar System's own devices, Jupiter would even become close to being a star. However Jupiter has the materials of a star it lacks the mass. It has to be a minimum 80 times more massive to even be a low mass star(red dwarf). Jupiter doesn't have enough mass to fuse hydrogen into helium. Jupiter actually isn’t much smaller than some brown dwarf stars, which are the true failed stars that lacked enough hydrogen to sustain fusion. A brown dwarf is a type of substellar object that has a mass between the most massive gas giant planets and the least massive stars, approximately 13 to 80 times that of Jupiter (M J).. Jupiter has a mass that is 0.1% that of the Sun's. It is considered that because it has 2.5 times all the mass if all the other planets were added together. That makes it the tiniest known star to support hydrogen fusion in its core, the process that keeps stars burning until they run out of fuel. You could fit a thousand Jupiters inside the sun! Jupiter by mass is about 73 percent hydrogen and 24 percent helium. So the smallest red dwarf star is still about 80 times the mass of Jupiter. That makes it the tiniest known star to support hydrogen fusion in its core, the process that keeps stars burning until they run out of fuel. Stars require a certain amount of mass to spark thermonuclear fusion – in other words, to shine. With a imply radius of round 59,000 kilometres, it is only a smidge bigger than Saturn. Jupiter would have to have 80 times more mass than it does now, in order to ignite in its interior and shine as stars do. This is a bit misleading. It doesn’t have a solid ground and is made up of the same elements as the Sun. Earth, Space, Human World, Tonight. In our Solar System, there are two objects larger than this teeny star. Jupiter is the fifth planet from the Sun and the largest in the Solar System.It is a gas giant with a mass one-thousandth that of the Sun, but two-and-a-half times that of all the other planets in the Solar System combined. It's for this reason that Jupiter is sometimes called a failed star. If it had just accumulated more dust and gas during its infancy—approximately 80 times more—Jupiter could have achieved enough mass to ignite nuclear fusion in its core. However, despite its enormous size, Jupiter is not massive enough to turn into a star, which is why the word ‘failed star’ is a misnomer . Illustration of Jupiter and its moon Io. Scientists say Jupiter needs to be 75 times more massive to become a star. Jupiter by mass is about 73 percent hydrogen and 24 percent helium. Jupiter would have to have 80 times more mass than it does now, in order to ignite in its interior and shine as stars do. Jupiter is more than 2 times as massive as all planets combined and still not massive enough to start fusion between helium and hydrogen. Stars have to have enough mass to get hot enough inside to spark thermonuclear fusion reactions. That makes it the tiniest known star to support hydrogen fusion in its core, the process that keeps stars burning until they run out of fuel. 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