It takes longer for Venus to complete a rotation on its axis than it does to complete an orbit around the sun.

When we look at the Andromeda galaxy from Earth, because it is 2.5 million light years away, it looks to our eyes like it was 2.5 million years ago.

The known population of Mars consists entirely of robots.

Saturn has a persistent hexagonal cloud pattern on its north pole.

Eventually, the expansion of the universe will speed up enough that everything galaxies will race away from one another.

Neptune has fourteen moons.