How do telescopes work?
Since the early 1600s, telescopes have helped us examine the stars. Early telescopes used two glass lenses to focus light. Today, we use mirrors in the same way as glass, but mirrors are lighter and easier to make than lenses. To see dim objects that are far away, these mirrors must be very large. T...
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| Format: | EBOOK |
| Language: | ENGLISH |
| Published: |
The Rosen Publishing Group, Inc
2021
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| Series: | Tell me how it works |
| Subjects: |