U6 Vocab Flashcard

Front

What is the Universe?

Back

Space and all energy and matter in it.

Front

Solar System:

Back

Collection of bodies orbiting the sun.

Front

What is a Planet?

Back

A spherical body that orbits the sun.

Front

What is a Star?

Back

A large celestial body composed of gas that emits light.

Front

What is a Galaxy?

Back

A large collection of stars, gas, and dust held together by gravity.

Front

Nebula:

Back

A large cloud of gas and dust in space.

Front

Light Year:

Back

The distance light travels in one year.

Front

Apparent magnitude measures a star's brightness as seen from Earth.

Back

The measure of a star's brightness as seen from Earth.

Front

Luminosity

Back

The actual brightness of a star

Front

Absolute magnitude:

Back

Brightness of a star at a standard distance.