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Components of the Universe and the Big Bang Theory

Across
Scientist who discovered that our universe is expanding quickly.
A space rock containing a head and tail, and is mostly made up of frozen gases and dust.
A type of galaxy with no fixed shape.
Flat or spherical galaxy with no internal structure.
A satellite of a planet, stays in orbit.
A streak of light from a space rock that burns up in Earth's atmosphere.
A theory explaining the formation of the universe.
All matter, space, and everything in space.
The name of our galaxy.
A galaxy containing three parts: a bulge, disk, and a halo.
Type of matter that does not give off electromagnetic radiation and can't be seen directly.
Down
A meteor that strikes the Earth's surface.
Astronomer who discovered dark matter.
Physicist that discovered radiation from the big bang.
The four inner planets with rocky surfaces.
The outer planets with slushy surfaces, otherwise known as Gas Giants.
An irregulary shaped, stony metallic bodies that are too small to be planets. Mostly concentrated in a belt.
A giant cloud of gas and dust between two stars.
A group of stars grouped together by gravity.
A combination of gas and dust that produces its own light and heat.