2007-05-23 04:03:10 · 15 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
Well our two closest neighbors in our solar system are also the closest in relation. Our 'sister' planet would be Venus. It is very close to the same size that we are - but everything else is completely different. Mars is also close in size, but somewhat smaller. Of all the planets, it is the most like ours (at least in our solar system).
I've not heard anything about a planet nearer to us that no longer exists. Some theorize that there used to be a planet between Mars and Jupiter - but was obliterated in some unrecorded cosmic event - thereby creating the asteroid belt between the inner planets and the outer planets. Others believe that it is just a whole lotta rocks that never formed into a planet.
2007-05-23 04:23:51 · answer #1 · answered by Mr. Indignant 4 · 0⤊ 0⤋
Venus used to be called Earth's sister planet, because it is about the same size and mass. Before space craft went there, people supposed it could be a nice place, possibly with water and moderate temperatures. Now that space craft have shown it to have a poisonous carbon dioxide atmosphere with sulfuric acid clouds and a surface temperature of 900 degrees, you don't hear that sister planet moniker any more.
2007-05-23 04:33:29 · answer #2 · answered by campbelp2002 7 · 1⤊ 0⤋
Yea, the myth about Lilit...A dark sister of the Earth, placed by astrologers. There is no evidence for such celestial body, and the story originates from some alternative myth about Adam and Eve story: Adam and Lilit were equal, made like man and woman. And then Lilit became too strong so she was banished, so God made Eve out of Adam (since he had no more of the same material to make a woman independently).... Or something like that...
2007-05-23 04:18:40 · answer #3 · answered by Wintermute 4 · 0⤊ 0⤋
It was once believed that a planet called Vulcan followed the orbit of Earth. This theory was required because the orbit of mercury didn't exactly work out to how Isaac Newton's theory thought it should. Vulcan happened to always be precisely on the other side of the sun, which is why we couldn't see it.
Einstein's work led to an update in the equation used for how gravity works (leaving out the technical details): since his theory explained Mercury's orbit perfectly, Vulcan was no longer required.
2007-05-23 04:18:21 · answer #4 · answered by Anonymous · 1⤊ 1⤋
There was also the fantasy of a duplicate planet earth traveling in exactly the opposite side of the earth orbit, so we would never realize that it was there, and vise versa.
But short of that, Venus is your sister.
2007-05-23 04:43:25 · answer #5 · answered by Lorenzo Steed 7 · 0⤊ 0⤋
Our neighboring planets are Venus and Mars. Of the two, Mars is more to our liking. I'm not sure, but there was a theory that Venus and Mars were once close in their orbit path, and there was a gravity tug-of-war in with Mars lost. This was to suggest that perhaps Mars had more water at one time , and now it's bone dry.
2007-05-23 04:23:17 · answer #6 · answered by Anonymous · 0⤊ 1⤋
Total nonsense - but Venus is often known as our sister planet, as it's roughly the same size as Earth and right next door (close in astronomical terms).
2007-05-23 04:08:21 · answer #7 · answered by Hello Dave 6 · 3⤊ 0⤋
Yes it did billions of years ago but the plants were traviling at diffrent speeds and different orbit paths that crossed and the collided creating the moon.
The planet was about the size of Mars.
2007-05-23 10:43:08 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Probably Venus or Mars. More likely Venus before scientist knew that is was lava, because of the same size, but now no
2007-05-24 11:31:49 · answer #9 · answered by Anonymous · 0⤊ 0⤋
Mondas - the planet of the Cybermen in Doctor Who. I.e. its Science Fiction.
2007-05-23 22:31:56 · answer #10 · answered by Spacephantom 7 · 0⤊ 0⤋