2007-07-17 03:56:19 · 3 answers · asked by whitney b 1 in Science & Mathematics ➔ Astronomy & Space
All the planets in our solar system formed at roughly the same time, about 4.6 billion years ago. A giant molecular cloud in space collapsed under its own gravity and began rotating, forming a disc. Then clumpy sections in this disc of dust & debris began attracting more matter and these eventually became the planets. The largest mass at the centre of the disc became the sun.
2007-07-17 04:09:27 · answer #1 · answered by Nature Boy 6 · 2⤊ 0⤋
I don't think we really know that yet. We have only landed on two other planets, and I think we were only able to retrieve material from Mars, and it hasn't gone back to earth yet.
(btw, evolved isn't quite the right word, formed would be closer. Evolved is specific to ecology and how species change over time. It is sometimes also used when new thoughts or methods are formed in other areas, but planets don't evolve, the life on them may.)
2007-07-17 11:03:44 · answer #2 · answered by wayfaroutthere 7 · 0⤊ 0⤋
flip a few coins and guess and you'll have as good an answer as any
2007-07-17 11:01:45 · answer #3 · answered by Gene 7 · 0⤊ 2⤋