Space Flashcards
The sun, the planets, and smaller bodies
Solar system
A group of millions or billions of stars held together by their own gravity
Galaxy
Everything, space and all the matter and energy in it
Universe
An object that orbits a more massive object
Satellite
When an object strikes the surface of a larger object in space it explodes and leaves behind a round pit
Impact crater
The earth rotates around an imaginary line through it’s center
Axis of rotation
The motion of one object around another
Revolution
Patterns of temperature changes and other weather trends over the course of the year
Season
Sunlight shines on the southern and northern hemispheres
Equinox
A dark spot on the moon
Mare
Occurs when a shadow makes the sun or moon seem to grow dark
Eclipse
Is the darkest part
Umbra
Around the umbra is a spreading cone of lighter shadow
Penumbra
Is earth’s average distance from the sun
Astronomic unit
The shape of each orbit
Ellipse