tombi123 on 12 March 2009
Possible, but I doubt it.
1) Humans have found no evidence of ET beings on Earth (fossils, spaceship remains etc).
2) There is no Planet anywhere near to Earth that is likely to be able to produce intelligent life.
The planet would need to be close by unless they had figured out how to get around not being able to travel faster than light. If the planet was more than 100 light years away they probably wouldn't make it to Earth (alive).
