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## PowerPoint Slideshow about ' Astronomy!' - eleanor-turner

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3. Galaxies

Andromeda Galaxy (M31). Image: NASA

4. Clusters of Galaxies

Abell Cluster of Galaxies. Image: NASA

How do astronomers study?

- Observations: Telescopes
- Theory: Computer Simulations and Models

The Speed of Light

- Speed of light: c = 3.00 x 108 m/s
- Because light has a finite speed, the light that reaches us from distant objects was emitted many (i.e. millions or billions) years ago
- This means, in astronomy, looking far away is the same as looking back in time!

Night vision goggles can see infrared!

X-rays pass through your skin but not your bones!

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