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