Space Flashcards
Solar system
The sun and its family of orbiting planets, moons, and other objects.
Galaxy
Billions of stars held together in a group by their 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 it surface.
Axis of rotation
An imaginary line which a turning body, such as earth rotates
Revolution
The motion of one body around another, such as earth in its orbit around the sun. The time it takes an object to go around once.
Season
A part of a pattern of temperatures changes and other weather trends over the year. They are caused by the position of the earth to the sun.
Equinox
In an orbit, a position and time in which sunlight shines equally on the Northern and Southern Hemisphere. A time of the year when daylight and darkness are nearly equal for most of the earth.
Solstice
In an orbit, a position and time which one hemisphere has maximum light and the other has minimum amount.
Mare
A large dark plain of solidified lava on the moon
Eclipse
An event during which one object in space casts a shadow on another
Umbra
The dark central region of a shadow, such as the cone of the complete complete shadow cast of an object
Penumbra
A region of lighter shadow that may surround an umbra
Astronomical unit (AU)
Earths average distance from the sun which is 150 million kilometers