A person who travels in space.
Scientist who observes and studies planets, stars, and galaxies.
All the gases which surround a star, like our Sun, or a planet, like our Earth.
An imaginary straight line around which an object spins.
The tiny building block that makes up everything.
An invisible object in outer space formed when a massive star collapses from its own gravity. A black hole has such a strong pull of gravity that not even light can escape from it.
To make less clear, to run together.
BIG BANG THEORY
A theory that says the universe began with a super-powerful explosion.
A flash of lightning.
A very large piece of rock.
Easy to break or crack.
To swell or stick out; the part that swells or sticks out.
To fall down or fall to pieces.
A crash or forceful joining together.
A big ball of dirty ice and snow in outer space.
An astronaut from the former Soviet Union or present day Russia.
A hole caused by an object hitting the surface of a planet or moon.
To discover something which is hidden or unknown.
The power to do work.
Everything that surrounds anything.
To make larger.
Anything that is burned to give heat or power.
An invisible form of energy that is given off by atoms.
An empty space.
A form of matter which is not a liquid or a solid. A gas will spread out to fill up all of the space that is open to it.
The invisible force between objects that makes objects attract each other.
The attraction that one object has for another object due to the invisible force of gravity.
The section of the Apollo spacecraft designed to land on the Moon.
The car-like vehicle used by Apollo astronauts while exploring the Moon's surface.
What all things are made of.
An object from space that becomes glowing hot when it passes into Earth's atmosphere.
A piece of stone or metal from space that falls to Earth's surface.
A piece of stone or metal that travels in outer space.
A part of a set that can be arranged together in different ways.
Old stories that usually explain how something came to be.
A process where atoms are joined and tremendous amounts of energy are released.
Cargo which is carried on the Space Shuttle.
A person who studies physics.
The study of how objects (from the very tiny to the very big) behave.
Large pieces of flat land.
The point at either end of the invisible line known as the axis. Planets have a south pole and a north pole.
The return of a spacecraft into Earth's atmosphere.
To throw back light, heat, or sound.
Can be used again.
To move in an orbit or circle around something.
To turn around a center point, or axis, like a wheel turns on a bicycle.
Going in many different directions.
Having to do with the Sun.
A storm or eruption of hot gases on the Sun.
Streams of gas particles flowing out from the Sun.
An unmanned research craft sent into space.
The picture produced by a spectroscope.
An instrument that breaks up the white light from a star into its different colors.
A dark area on the Sun's surface that is cooler than the area around it. Sunspots are caused by magnetic storms on the Sun.
An explosion of a star that causes the star to shine millions of times brighter than usual.
The huge space which contains all of the matter and energy in existence.
Something used to carry people and things over land or in space.
Able to be seen.
An opening in a planet's surface through which hot liquid rock is thrown up.
Having little or no weight; not feeling the effects of gravity.
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