2006-12-27 14:05:59 · 26 answers · asked by Syed S 1 in Science & Mathematics ➔ Astronomy & Space
If you mean our solar system it's Jupiter. If you consider the sun to be a planet (although it's really a star) then the sun. And if you really mean universe then you are completely out of your mind because if you look up the definition of the universe you'll find that it contains EVERYTHING in it and it would be impossible to tell.
2006-12-27 14:09:39 · answer #1 · answered by superhotshot999 2 · 1⤊ 2⤋
The largest a planet can be depends on what you mean by large. Do you mean large as in circumfrance or large as in massive?
A planet can only have so much mass before it becomes a star. Hydrogen must be present for this to happen though. Hydrogen is one of the most abundant elements in the universe. The Earth is too small to hold onto hydrogen but it's very likely that most larger planets have an abundance of hydrogen.
Hydrogen will start fusing into helium when the planet reaches around 1.33 × 10^29 kilograms...70 times the mass of Jupiter, and the planet will become a star.
2006-12-27 14:56:30 · answer #2 · answered by minuteblue 6 · 1⤊ 0⤋
The planet, dubbed HAT-P-1, is located some 450 light-years from Earth in the constellation Lacerta.
It is the largest planet ever discovered and boasts a radius nearly 1.4 times larger than Jupiter's.
Largest Known Planet Discovered, Astronomers Announce
Brian Handwerk
for National Geographic News
September 14, 2006
Astronomers say they have discovered what appears to be an entirely new kind of planet, an extra-large gas giant unlike any known world in our solar system or beyond.
"This questions our understanding of how giant planets are formed and evolve," said Robert Noyes, a senior physicist at the Harvard-Smithsonian Center for Astrophysics (CfA).
TO someone up^there - W CEPHEI is a variable star, not a planet. But it 'is' HUGE.
http://en.wikipedia.org/wiki/Cepheid_variable_star
2006-12-27 14:17:05 · answer #3 · answered by ? 4 · 1⤊ 0⤋
There is an upward limit to the mass of the planet and it is about 15 times as massive as Jupiter. Then it would become a Brown Dwarf (a failed star).
But the sizes of the most massive planets are not much bigger than Jupiter, because of gravity pulling in the mass in as quickly as it's added.
So in short, we don't know the name of the largest planet yet. But on wikipedia there is a list of extrasolar planet extremes. Try this link:
http://en.wikipedia.org/wiki/List_of_extrasolar_planet_extremes
2006-12-27 15:01:06 · answer #4 · answered by phsgmo 2 · 0⤊ 0⤋
The universe??? Do you mean the solar system?? No one can ever know the largest planet in the universe, as the universe is too big.
Jupiter is the largest planet in our solar system. The sun is a star, not a planet.
2006-12-27 14:08:10 · answer #5 · answered by Snowth 4 · 2⤊ 0⤋
Hi:
No I can't , Have not been around the Milky way galaxy. Much less the Universe and visited all the planets in all hundreds of billion galaxies, Only the Creator knows all the hundred of hundreds of billions of planets in anyone of the them. However in our Solar system it would be Jupiter. In fact it take light about 100 million years to go from one end of the galaxy to the other. Also with all the Supernovas and Black Holes out there. your Planet might be here this million eon and gone the next. - Food for thought.
2006-12-29 11:20:30 · answer #6 · answered by Anonymous · 0⤊ 0⤋
The largest planet in solar system is Jupiter . There are many galaxies in the universe and there are many stars but their planets are not discovered till now.
2006-12-27 14:12:42 · answer #7 · answered by Cute girl 2 · 1⤊ 0⤋
I can't, and neither can anyone else give you an answer to this question. There are probably billions of planets in the universe which we are unable to see and so it is impossible to answer your question. However, if you want to know the largest planet in this Solar System, it is Jupiter.
2006-12-27 14:09:06 · answer #8 · answered by Troy 3 · 2⤊ 0⤋
The largest discovered planet is "GQ Lup b" that is the only extrasolar planet that we can actually see through a telescope and it is about 21.5 times more massive than Jupiter. It is orbiting "GQ Lupi" a young T-Tauri star, located in the Lupus I (the Wolf) cloud, a region of star formation about 400 or 500 light-years away. Scientists cannot really tell whether it is a planet or it is a brown dwarf ( http://www.eso.org/outreach/press-rel/pr-2005/pr-09-05.html ).
2006-12-27 18:11:38 · answer #9 · answered by Sporadic 3 · 0⤊ 0⤋
I believe Jupiter is the largest known planet in this universe. And the sun is a star!
2006-12-27 14:08:15 · answer #10 · answered by tooterbutton 2 · 1⤊ 1⤋
Jupiter is the fifth planet from the Sun and by far the largest. Jupiter is more than twice as massive as all the other planets combined (the mass of Jupiter is 318 times that of Earth).
2006-12-27 14:10:45 · answer #11 · answered by MsFancy 4 · 1⤊ 1⤋