The Universe

Front

Big Bang theory

Back

A scientific theory concerning the early development and shape of the universe from a dense state, which began and is still expanding.

Front

Black hole

Back

A region in space where gravity is so strong that even light cannot escape.

Front

Cosmic microwave background (CMB)

Back

Electromagnetic radiation that remains from the Big Bang and early stages of the universe.

Front

Galaxy

Back

A system of stars and associated matter held together by gravitational attraction.

Front

Hertzsprung-Russell diagram

Back

A diagram that shows the relationship between the brightness, surface temperature, and color of stars.

Front

Luminosity

Back

Total amount of light (energy) emitted by a star or other celestial body.

Front

Magnitude

Back

The measure of the observed visible brightness of a star.

Front

Milky Way galaxy

Back

The galaxy which contains our Sun and its solar system, including Earth.

Front

Nebulae

Back

Clouds of dust and gas; site of star formation; remains of dead or dying stars.

Front

Red-shift

Back

Observations of galaxies moving away from each other and our own Milky Way galaxy.