Vocab planets Flashcards
Orbit
The path of an object in space as it moved as it moves around another object due to gravity
Solar system
The sun and its family of orbiting planets and moons and other objects.
Galaxy
Millions and billions of stars held together in a group by their own gravity
Equinox
In an orbit, a position and time in which sum shines equally on both hemisphere.
Universe
Space and all the matter and energy in it
Sulstice
In an orbit, a position and time during which own hemisphere receives the maximum sunlight
Mare
A large dark plain of solidified lava on the moon
Umbra
A dark central region of a shadow such as the come of the complete shadow cast by an object
Penumbra
A region of lighter shadow that may surround a dark central region.
Astronomical unit
Average distance from the sun which is 93,000,000 miles
Elipse
An oval or flattened circle
Terrestrial Planet
A planet that has a rocky surface
Gas giant
A large planet that consists mostly of gases in a dense form
Asteroid
A small solid rocky body that orbits the sun
Meteorite
A small object from outer space that passes through earths atmosphere and reaches the surface
Geocentric Theory
Earth centered theory of the solar system
Tides
The rise and fall of the oceans surface levels due to the gradation always pull of the sun and moon
Waxing
The gradual increase of the illuminated surface of the moon
Waning
The gradual decrease of the illuminated surface of the moon
Gibbous
More than half but less than fully eliminated
Crescent moon
The illuminated surface is less than a quarter illuminate
Full moon
The moon surface is fully eliminated
Quarter moon
Half of the moon surface is eliminated
Impact creator
A round pit left behind on the surface of s planet after a smaller abject strikes the surface
