Maci Flashcards
The path of an object in space as it moves around another object due to gravity
Orbit
The Sun and its family of orbiting planets and moons and other objects
Solar system
Millions and billions of stars held together in a group by their own gravity
Galaxy
Space and all the matter and energy in it
Universe
An object that orbits a more massive object
Satellite
A round pit left behind on the surface of a planet after a smaller object strikes the surface
Impact crater
An imaginary line about which a turning body such as Earth rotates
Rotation
The motion of one body around another, such as the Earth in its orbit around the Sun
Revolution
One of a pattern of temperature changes and other weather trends over the course of a year
Season
In an orbit, a position and time in which sun shines equally on both hemispheres
Equinox
In an orbit, a position and time during which one hemisphere receives the maximum sunlight
Solstice
A large dark plain of solidified lava on the moon
Mare
An event during which one object in space casts a shadow onto another
Eclipse
The dark central region of a shadow such as the cone of complete shadow cast by an object
Umbra
A region of lighter shadow that may surround a dark central region
Penumbra
