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Galaxy - Types and Contents

What is a light year? the distance that light travels in one year
How is the distance of a star calculated? by light years
What is a galaxy? a large group of stars, dust and gas
How many stars does the largest galaxies contain? trillions
What is the size of most stars? most are much larger than Earth
Are all stars the same distance from Earth? stars may appear to be similar distances away but their distances vary greatly
Who began classifying galaxies in the 1920's? Edwin Hubble
What was Edwin Hubble's occupation? astronomer
What is a spiral galaxy? a galaxy that has a bulge at the center and spiral arms
What are the spiral arms in a spiral galaxy made up of? gas, dust and new stars
What is an elliptical galaxy? a massive blob of stars that have very bright centers and very little dust and gas
What do elliptical galaxies mostly contain? old stars
How many of all galaxies are elliptical galaxies? about one-third
What are irregular galaxies? galaxies that don't fit into any other class
Where are many irregular galaxies located? close to large spiral galaxies
In what type of galaxy is the Milky Way located? a spiral galaxy
What keeps astronomers from having a good view of our galaxy? gas, dust and stars
What are galaxies composed of? billions of stars and some planetary systems
What is a nebula? large clouds of gas and dust that can be found in galaxies
What forms in some regions of nebula? new stars
What are 3 characteristics found in some types of nebula? they glow; absorb light and hide stars; reflect starlight
What type of galaxy usually contain nebula? spiral galaxy
What type of galaxy contains very few nebula? elliptical galaxy
What are gobular clusters? groups of older stars that look like a ball
How many stars make up a gobular cluster? up to 1 million stars
What are open clusters? groups of closely grouped stars
Where are open clusters usually located? along the spiral disk of a galaxy
How many stars make up an open cluster? a few thousand stars
What does newly formed open clusters have? many bright blue stars
Why is looking through a telescope like looking back in time? it takes time for light to travel through space
What are some of the most distant objects that scientists study called? quasars
What are quasars? star-light sources of light that are among the most powerful energy sources in the universe
What does some scientists believe quasars may have caused in the cores of young galaxies? black holes
How can galaxies form new galaxies? they can collide with one another
What is the closest spiral galaxy to the Milky Way? Andromeda
At what speed are the Milky Way and Andromeda moving toward each other? 500,000 km/h
How many years will it take for the Milky Way and Andromeda to collide? 5 billion years
Created by: ndmsteach