The Universe is an unimaginably huge place. It contains billions of galaxies and each galaxy contains billions of stars. Around one of those stars, the Sun orbits is the planets Earth. Our planet is the only place in the Universe that we know contains life. Scientists are constantly discovering amazing new facts about the Universe. Therefore, the one thing  we know for sure is that there is still plenty that we have yet to find out.    

Earthrise is the earth appears over the horizon on moon. This picture was taken from the spaceship Apollo 10 while it was in orbit around the Moon.