Science Vocab Unit 1

Front

to spin on its axis

Back

rotate

Front

Move in a circle around a central axis

Back

revolve

Front

Star at the center of our solar system

Back

the Sun

Front

Path of an object revolving around another in space

Back

orbit

Front

Imaginary line through Earth's center and poles, about which Earth rotates.

Back

axis

Front

Planets beyond the asteroid belt: Jupiter, Saturn, Uranus, Neptune.

Back

outer planets

Front

Rocky, terrestrial planets (Mercury, Venus, Earth, Mars) within the asteroid belt.

Back

inner planets

Front

A force that pulls objects toward each other

Back

gravity

Front

A celestial body resembling a small planet but not meeting all criteria.

Back

dwarf planet

Front

A natural satellite that revolves around a planet.

Back

moon