Astronomy Glossary

Text provided by: Kids Astronomy

Airglow

- The natural glow of the night sky due to reactions that take place in the Earth's upper atmosphere.

Aurora

- Beautiful lights seen over the polar regions which are caused when energized particles from the Sun react with the Earth's magnetic field.

Black Hole

- A region of space around a very small and extremely massive object within which the gravitational field is so strong that not even light can escape.

Comet

- A region of space around a very small and extremely massive object within which the gravitational field is so strong that not even light can escape.