2007-02-08 00:27:50 · 6 answers · asked by Duke 6675 1 in Science & Mathematics ➔ Astronomy & Space
Over a hundred planets have been observed by their effects on their parent stars. Since all of these are within a small number of light-years, if the distribution of planets is even through the universe there must be trillions of planets, and probably billions of inhabitable ones. (Of course, we still have to get there).
2007-02-08 00:39:10 · answer #1 · answered by poorcocoboiboi 6 · 1⤊ 0⤋
Ignoring the recent shenanigans about whether Pluto is a planet or not there are 9 known planets, all in our solar system. The couple of hundred other planets 'known' around other stars are not known because they haven't been observed; they are inferred to exist because of unexplained orbital perturbations of their stars. The presence of one or more planets is not the only possible explanation, however, merely the most likely.
2007-02-08 03:30:43 · answer #2 · answered by narkypoon 3 · 0⤊ 0⤋
As of February, 2007, there are 210 (..http://vo.obspm.fr/exoplanetes/encyclo/encycl.html..) Add the 8 in our solar system and you come up with 218 known planets in the known universe.
2007-02-08 02:27:25 · answer #3 · answered by Chug-a-Lug 7 · 1⤊ 0⤋
well, I don't know. But I do know how many of them have life on them.
If the size of the universe is infinite, and ( as our present understanding has it ), so far WE are the only intelligent life, then it's relatively easy to calculate how many planets out there have life; If you divide the number of known planets which have life ( 1- us ) by the number of planets that exist iin the universe ( infinite- because space IS infinity itself) then the answer is so close to infinity that makes no odds. Based on this chance of life ever occurring WE should not exsit!
The straightforward answer to your question is: infinite.
2007-02-08 01:57:40 · answer #4 · answered by pete m 1 · 0⤊ 0⤋
there are billions and Billions, of planet out there!!
2007-02-08 00:43:04 · answer #5 · answered by Anonymous · 0⤊ 1⤋
If we could see them all, they would be countless.
2007-02-08 00:32:59 · answer #6 · answered by Ivor Hugh G.Rection 6 · 0⤊ 1⤋