The sun emits radiation (light and heat) in a spectrum of waves. The electromagnetic (EM) spectrum ranges from low-frequency radio waves to high-frequency gamma rays. A tiny sliver of the EM spectrum is visible light.

Illustration courtesy NASA

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solar energy
solar energy Encyclopedic Entry

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6 - 12 and up

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Solar energy is created by nuclear fusion that takes place in the sun. It is necessary for life on Earth, and can be harvested for human uses such as electricity.

sun
sun Encyclopedic Entry

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8 - 12 and up

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Earth science, Physics, Biology

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The sun is an ordinary star, one of about 100 billion in our galaxy, the Milky Way. This ordinary star makes possible all life in the known universe.