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Astronomy 101: The Solar System
Lesson 4: Telescopes
Topic: Reflecting vs. Refracting Telescopes

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In Lesson 4, we explore the technologies that astronomers have developed, and continue to develop, to detect light from the universe, at both visible and invisible wavelengths. At visible and near-visible wavelengths, we compare and contrast reflecting and refracting telescope designs, as well as detectors, including spectrographs. We explore why astronomers build bigger and bigger telescopes, and consider both design and atmospheric limitations. We explore technologies that are being developed to overcome atmospheric limitations -- to untwinkle the stars. We also explore how light is detected at radio wavelengths, which can be done from the ground, and at other wavelengths, which requires observing from space. We learn that a great deal can be gained by observing the same object at multiple wavelengths.

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