Asteroid
A small object that’s made of rock that orbits the sun.
Astronomical unit
The average distance from the sun which is about 93,000,000 miles.
Comet
A body of ice and dust that orbits the sun.
Crater
A round pit left on a surface left by something that hit the surface.
Crescent moon
A quarter of the moon is illuminated.
Equinox
The time or date twice a year.
Ellipse
An oval or flattened round object.
Eclipse
It’s when the sun, moon, and moon all meet.
Galaxy
A group of solar systems, gases, and dust are held together by gravity.
Gas giant
Planets that are mostly gas.
Gibbous moon
A moon that’s looks half illuminated but is less than full.
Geocentric
Having the earth as the center.
Meteor
A streak of light in the sky.
Meteorite
A piece of rock that strikes earth’s surface.
Gravity
A force that’s in between two objects.
Heliocentric
Sun centered in the solar system.
Impact crater
A bowl shaped cavity in a planet’s ground.
Orbit
Its where a planet goes in a circle around the sun.
Mare
Astronomers mistook them for oceans.
New moon
The entire surface of the moon isn’t illuminated.
Solar system
It’s where the sun and planets are.
Quarter moon
Half of the moon is illuminated.
Penumbra
Region of lighter shadow that might surround a dark central region.
Revolution
The orbiting of a planet around another planet.
Satellite
An artificial object that orbits around another thing in space.
Rotation
The spinning of a celestial body such as a planet.
Season
A period of the year on a planet.
Solstice
It’s when the sun reaches its highest or lowest point.
Terrestrial planet
A planet that is rocky or bumpy.
Umbra
The dark part of a sunspot.
Tides
The rise and fall of the oceans by the gravitational pull of the sun and EARTH.
Universe
Everything that exists in and on the Earth.
Waxing moon
It’s when the moon changes or it’s also called the lunar phase.
Wannig
The gradual decrease of the moon.