Space is fascinating!
Space is big. The universe is larger than we can understand. The universe is so large that stars larger than our Sun or even whole galaxies look like tiny pinpoints of light because they are so far away.
Space contains every bit of matter and energy that has ever existed, and yet most parts of it are utterly empty. In this document, when we talk about deep space, we usually mean the vast stretches of empty area between planets.
Space can be beautiful. The planets, stars, galaxies and nebulae make graceful and colorful shapes visible to our telescopes.
Space can be dangerous. In deep space we would die instantly unless protected. Our home planet the Earth travels through space, with the atmosphere making a cozy blanket between us and the cold and other dangers of deep space.
More about space:
What is in space?
How do objects in space travel?
How does gravity work in space?
Is there energy in space?