The man from space watched the wisest human on this primitive Earth.

The primitive earth on which life originated was a very different environment from what is found on our planet today.

Phosphates are believed to have been essential compounds in the evolution of early life on the primitive earth.

Strange, then, that life seems to have arisen at the earliest moment possible, almost immediately after the primitive earth had cooled enough.

He tried to calculate how long it would take the message to reach primitive Earth, but adjusting for the time warp made his head spin.

These results indicate guanine could arise in frozen regions of the primitive earth.

The green colour is due to the presence of certain unoxidised minerals found in the primitive earth because O was not present.

They suggested two years ago that early life both on Mars and on the primitive Earth might have existed in similar conditions.

Those two rates enable us to compute the total amount of amino acids that were formed on the primitive earth.

"The hazy moon may hold clues to how the primitive Earth evolved into a life-bearing planet."