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Stars, Galaxies, & the Universe

NAME __________________________________________
Across
The blue-white hot core of small and medium stars
Groups of 2 or more stars
This type of galaxy has arms that look like pinwheels
A system in which one star blocks the light of another
This formed about 5 billion years ago when a giant cloud of gas & dust collapsed
The most massive stars become ____ ____ when they die
According to this theory, the universe formed in an enormous explosion about 10-15 billion years ago
A large amount of gas in a relatively small area
The earliest stage of a star's life
Down
"Our galaxy"
Distant galaxies with giant black holes at their centers
This may contain as much as 3 times the mass of the sun but be only about 20 km in diameter
Astronomers estimate that this has been expanding for 10-15 billion years
How long a star lives depends on how much ____ it has
In the 1920s, this American astronomer discovered that the farther away a galaxy is from us, the faster it is moving away
Star systems with 2 stars, also called double stars
Medium-mass stars like the sun live for about ___ billion years
This type of galaxy does not have a regular shape
This type of galaxy looks like a flattened ball
When a dying giant or supergiant explodes