Science Flashcards
Solar system
The sun and its family of orbiting planets moons and other objects
Galaxy
Millions or billions of stars held together in a group by their own gravity.
Universe
Space and all the matter and energy in it.
Satellite
An object that orbits a more massive object
Impact crater
A round pit left behind on the surface of a planet or other body in space after a smaller object strikes the surface.
Axis of rotation
An imaginary line about which a turning body such as earth rotations
Revolution
The motion of one body around another such as earth in its orbit around the sun
Season
One part of a pattern of one temperature changes and another whether trends over the course of a year
Equinox
In an orbit a position and time in which sunlight shines equally on the northern hemisphere and the Southern Hemisphere
Solstice
In an orbit a position and time during which one hemisphere gets its maximum area of sunlight
Mare
A large dark plain of solidified lava on the moon
Eclipse
An oval or flattened surface.
Umbra
The dark central region of a shadow such as the cone of complete shadow cast by an object
Penumbra
A region of lighter shadow that may surround an umbra
Astronomical unit UA
Earths average distance from the sun which is approximately 150 million kilometers