Scientists say there can't be any kind of life on Mercury. When you look up at the sky, the brightest objects you can see are the sun and the moon. The next brightest is Venus. It is closer to Earth than any other planet. But it is very different from Earth.
Earth has lots of water, mostly in the form of oceans, rivers, and lakes.
The only water we know of on Venus is in the form of water vapor. Earth turns on its axis in 24 hours. Venus turns on its axis very slowly. More than half a year passes on Earth before Venus has a new day. Venus's clouds swirl around fast.