Prelude to life (4,550-3,900 mya) Planet Earth is very hot at its formation ... of an event or discovery from the evidence at hand is known as inference. Life's origins (3,850 mya) Evidence ...

Venus, on the other hand, has a thick atmosphere which holds ... On the surface of Jupiter there is a huge red spot twice as wide as planet Earth. When the Voyager 1 probe flew past Jupiter ...