Term
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Definition
| A large collection of stars, gas, and dust held together by gravity. |
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Term
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Definition
| Includes space and all the energy and matter in it. |
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Term
Which has fewer stars?
galaxy or universe |
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Definition
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Term
Which has fewer stars?
galaxy or solar system |
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Definition
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Term
| Which galaxy are Earth and our solar system located in? |
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Definition
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Term
| What did William and Caroline Herschel determine by measuring relative distance of the stars in the Milky Way? |
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Definition
| The shape of the Milky Way |
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Term
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Definition
| Large groups of stars studied by Harlow Shapley. |
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Term
| All the globular clusters Shapley studied were arranged in one large shape. What is the shape? |
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Definition
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Term
| Were the globular clusters Shapley studied centered around our sun? |
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Definition
| No, the globular clusters Shapley studies centered around a point in space far from Earth. |
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Term
| After observing that the globular clusters he studied were centered around a point in space far from Earth, where did Shapley conclude our solar system must be located? |
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Definition
| Outside the center of the sphere, within one of the outer spiral arms of the Milky Way Galaxy. |
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Term
| What did Shapley conclude caused areas of space that did not seem to have any stars? |
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Definition
The stars were too dim to be seen with his telescope.
Matter, such as dust could be blocking light from the stars.
Objects are too far away from Earth to be seen. |
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Term
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Definition
| The distance light travels in one year. |
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Term
| What unit do scientists use to measure distances in the universe? |
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Definition
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Term
| How far is it across the Milky Way? |
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Definition
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Term
| How many stars are in the Milky Way? |
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Definition
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Term
| What do scientists use to identify the distance of stars from Earth? |
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Definition
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