Multiple choice

How do scientists use the electromagnetic spectrum?

  1. by sending radio waves and reading their response

  2. they use to communicate with aliens

  3. by examining visible light rays

  4. they do not... they use light years
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Scientists use the electromagnetic spectrum to study objects in space by detecting the various wavelengths of radiation they emit, such as radio waves, which can penetrate dust clouds.

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