Universe Vocabulary 01.01-01.02

Front

Light year

Back

A unit of astronomical distance equivalent to the distance that light travels in one year, which is approximately 5.88 trillion miles (9.46 trillion kilometers).

Front

Scientific notation

Back

A way of expressing numbers that are too large or too small to be conveniently written in decimal form, using powers of ten.

Front

Celestial

Back

Any natural object existing outside Earth's atmosphere. These include planets, stars, moons, asteroids, comets, and galaxies.

Front

Planet

Back

A celestial body large enough to have its own gravitational pull.

Front

Planetary system

Back

A collection of planets orbiting the same star.

Front

Radiation

Back

The transfer of energy through waves.

Front

Spectrum

Back

A scale that has two extremes (like a number line).

Front

Emit

Back

To produce and discharge something, especially a gas or radiation.

Front

Wavelength

Back

The distance between waves.

Front

Frequency

Back

The number of waves that pass a given point in a certain amount of time.