Physical Science CH 20 The Universe Vocab

Front

Theory that all matter and energy was compressed and exploded 13-15 billion years ago, expanding in all directions.

Back

Big Bang Theory

Front

An object so massive and dense that not even light can escape its gravity.

Back

black hole

Front

A group of stars or galaxies bound by gravity

Back

cluster

Front

Change in wave frequency due to movement of source/observer.

Back

Doppler Effect

Front

A collection of stars, dust, and gas bound by gravity.

Back

galaxy

Front

Gas and dust between stars in a galaxy.

Back

interstellar matter

Front

Distance light travels in a year.

Back

Light Year

Front

A luminous object producing energy at a high rate; most distant in the universe.

Back

quasar

Front

A large reddish star, late in its life cycle.

Back

red giant

Front

A large gas celestial body that emits light.

Back

star