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# Study of Space by the Electromagnetic Spectrum

## Scientists use the electromagnetic spectrum to learn about objects in space.

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How Did They Do Science?

### How Did They Do Science?

Credit: Robert Lopez
Source: CK-12 Foundation

Today’s scientists have big toys: space rovers, deep-sea submersibles, electron microscopes, and lots and lots of others. But scientific studies began millennia ago. Many scientific questions can be answered with curiosity and a bit of smarts.

#### Amazing But True!

In "Earth Was Never Flat!", another Earth Science Real World Application, you learned that figuring out that we live on a sphere was not that hard. Much harder is figuring out the circumference of that sphere. Yet, Eratosthenes, who lived a couple of centuries BC calculated Earth’s circumference. Amazingly, he did it to within 1% of the actual number. In 1849, Hippolyte Fizeau calculated the speed of light. His calculation was within 2%. Neither of these men had advanced tools. Each of them asked a question and designed an experiment to answer it.

Credit: U.S. NOAA. Original uploader was The Anome at en.wikipedia derivative work: Gregors
Source: http://en.wikipedia.org/wiki/File:Eratosthenes%27_method_for_determining_the_size_of_the_Earth.svg

Eratosthenes' calculations of the size of the Earth [Figure2]

#### Can You Apply It?

1. What was the question that Eratosthenes was trying to answer?
2. What did the letter Eratosthenes received say? Why didn’t Eratosthenes just throw the letter away?
3. What data did Eratosthenes need to determine the answer to his question?
4. What was the question that Fizeau was trying to answer?
5. What data did Fizeau need to answer this question?
6. According to the speaker, how were these scientists different from other people?

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