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Components of the universe

Across
Group of galaxies held together by gravity
Cloud of gas and dust
Biggest star in the galaxy
Huge mass of energy and elements
A galaxy without a clear structure
What galaxy earth is in
Energy still flowing around the universe
Rocky object up to 600 ft. across
Looks like a spiral
A large point in the sky that is like a sun
Object made mainly of ice
Down
Huge group of very old stars
Small particle from asteroid
System of billion stars held together by gravity
Three dimensional, not really a shape
Where we live, a planet
Found out our universe is expanding
All existing matter and space as a whole
Matter that does not give off radiation
Our star that gives of enough heat