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ASTRONOMY TEST

Across
How the Moon looks to the Earth when the entire Moon is visible and lit-up.
The path that an object or planet follows around the sun.
America's space agency
Rocks that orbit in space, sometimes crashing into planets and other satellites.
Dark patches on the surface of the Moon that are smooth, flat plains.
The largest volcano in our solar system.
The different shapes Venus appears to take as it orbits the sun.
The layers of gases and mist that cover a planet.
To turn around a fixed point, the way a top spins.
A large magnetic field that surrounds the Earth and some other planets.
The solid most outer layer of the Earth.
Large fires that burst from the Sun, releasing energy into the solar system.
A physical force causing objects to pull on other objects.
Dark patches on the sun which are cooler than the rest of the sun.
A name given to Venus when it is visible in the early morning just before the sun rises.
This word means to pass over.
A special habitat that can sustain life.
The center of the Earth.
This is what we call the Moon when it is completely dark to the Earth.
Down
The stuff that makes up everything around you. Anything that occupies space.
A word used to refer to the Moon.
Molten or melted rock that flows from a volcano.
The layer of the Earth just below the Earth's crust and above the core.
Rock from space that hits the Earth's atmosphere and burns up.
The property that indicates how much matter is contained in an object.
This is what we call the Moon when we can see exactly half of the Moon lit up.
Ground water that is considered permanently frozen.
Planets that are "earth-like," having a solid surface upon which you can stand.
Planets that are not solid, but instead are made of gas.
Frozen carbon dioxide
Everything that exists in space, including planets, sun, and stars.
A scientist who built telescopes and studied astronomy.
A device that sends out signals that bounce off the surface of an object and return to the device.