Space is a vast and mysterious place. It is the area beyond Earth's atmosphere where stars, planets, and galaxies exist.
The universe is constantly expanding. Scientists believe that it started with the Big Bang about 13.8 billion years ago.
There are billions of stars in our galaxy alone. The Milky Way contains an estimated 100 to 400 billion stars!
Exploration of space helps us learn more about our own planet. Missions to other planets and moons provide valuable information about the origins of Earth.