Universe Vocab

Front

A system of millions or billions of stars, gas, and dust held by gravity.

Back

galaxy

Front

Unit of astronomical distance equal to light's travel in one year (9.4607 × 10^12 km).

Back

light year

Front

Definition of SATELLITE?

Back

A natural or artificial body that revolves around a planet.

Front

Motion causing day/night

Back

Rotation

Front

Axis

Back

Invisible line around which an object spins.

Front

Tilt

Back

Angle between an object's rotation axis and its orbital axis, perpendicular to the orbital plane. Earth's axial tilt is ~23.5°.

Front

Equator's warmth reason?

Back

Receives most direct sunlight.

Front

Hemisphere

Back

Imaginary circle around the Earth dividing it into two equal halves.

Front

New Moon

Back

Front

Full Moon

Back