Telescopes and Detectors
Telescopes and the Discovery of the Universe
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Mountains and valleys on the Moon

Up until the 1600s, people believed the Moon to be a perfectly smooth, heavenly body.

When he looked through his telescopes, Galileo saw the changing shadows of mountains and valleys cast by sunlight as the Moon moved through its phases.

Galileo discovered that the Moon:

  1. has a perfectly smooth surface
  2. has surface features like Earth
  3. shines like the Sun
  4. is a heavenly body
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