Space Dictionary

Space, also known as outer space, is the near-vacuum between celestial bodies. Everything from planets, stars, galaxies and black holes is found within space.

On Earth, space begins at the Kármán line. This is a line that is 100 km above sea level and is where Earth’s atmosphere is said to stop and outer space begins. It’s not a real boundary, but a convention used by scientists.

At Space Dictionary, you can discover incredible facts about space, our solar system and beyond. We are a completely free A-Z resource available for kids, students, parents and teachers to learn many interesting facts about space and the different objects found there.

List of Space Terms

You can browse Space Dictionary by using the A-Z listing below.