It definitely wouldn't happen that way. The sun cannot change it's mass so drastically in the middle of its lifespan to put the Earth into a different orbit. Earth would not fly off into space if it or the sun had less mass. Mars and Pluto both have less mass than Earth, are on both sides of Earth, yet they still orbit the sun. The only way for the Earth to have a different orbit is for it or the sun to have been a different mass in the first place, or if something large collided with Earth, but life would have adapted (denying that life is unable to adapt to certain situations is the same as denying that Earth orbits the sun) to those conditions if it were even able to form in them in the first place.Originally posted by: XanBcoo
and if the sun (or any other body) applied more or less gravity to earth, then the earth would leave its orbit (and fly off into space; or a whole bunch of other shit would be affected - the tides for example).
Many people also believe life was once present on Mars (there is some very good evidence). If Earth is so special, how could there have (possibly) been life on Mars at one point?
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