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Components of the universe

Across
Distance that light travels in one year
Stars that are in middle of life cycle
Means brightness
When blue stars are hotter and red stars are colder
Group of galaxies
Masses of rock left over from plants.
It is a collection of billions of stars
When stars gravity is strong enough that it squeezes the gas together sop tight that this occurs
They are rotating disks with the appearance of arms
A spiral shaped galaxy
A galaxy that has older red stars and have very low rates of star formation
Down
Most of these orbit between mars and Jupiter
Each one is unique in shape,age and structure
A very masses object orbiting the sun
10-15 billion years ago,our universe came into existence
They contain materials needed for the creation of stars
They are left over from the formation of stars and plants billions of years ago
What is a Gigantic ball of gas,mostly hydrogen gas
Closest star to earth and is in the center of our solar system