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10 Cards in this Set
- Front
- Back
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What is a telescope?
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an instrument used to see very far away
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What type of electromagnetic radiation do reflecting and refracting telescopes use?
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visible light
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What is a radio telescope?
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a telescope that uses radio waves
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Why are many large optical telescopes located on mountains?
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because the higher up the telescope is, the less atmosphere there is to make the image blurry
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What is a light year?
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The amount of distance light can travel in one year
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What is the name of our galaxy?
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The Milky Way
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What is the big bang theory?
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A theory that says the universe formed in a big explosion a long time ago.
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Why can't we use gamma ray, x-ray and ultraviolet telescopes on earth
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because gamma rays, ex-rays and ultraviolet rays are blocked by our atmosphere
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Reflecting telescopes differ from refracting telescopes because reflecting telescopes have
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a mirror instead of an objective lens
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The Milky Way galaxy is an example of
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galaxy
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