Facts about Sunlight

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To find out more about the diagram above . . . . read on!

Facts about Sunlight

Look carefully at the diagram at the top of the page. Now check out the following questions (and answers)!

  1. Why is sunshine important to human beings?
  2. What are other names for sunlight?
  3. Is sunlight made of waves or particles?
  4. How fast does sunlight travel through deep space?
  5. Why is too much ultra-violet radiation dangerous?

About the Diagram

Introducing the diagram! Read back and forward between the image at the top of the page and the explanation below!

This diagram introduces sunlight, the light produced by the Sun, the star at the centre of our solar system.

It gathers together some useful facts and introduces some important terms that you can check out in the next section.

Remember that:

  • As the Sun explodes with the force of a billion one-megaton nuclear bombs every second it gives off electromagnetic radiation.
  • Sunlight is a form of electromagnetic radiation.
  • The electromagnetic radiation given off by the sun includes all wavelengths of the electromagnetic spectrum.
  • By the time sunlight has passed through the atmosphere and reaches the ground it contains infrared, visible, and ultraviolet wavelengths of light.
  • Viewed from the ground, sunlight contains a portion of the electromagnetic spectrum.
  • Viewed from outer space, sunlight contains all of the electromagnetic spectrum.
  • Without sunlight, life as we know it would not be possible because it carries the energy that plants need to grow and the heat that keeps the world warm.

Follow the blue links for definitions . . . . or check the summaries of key terms below!

Some Key Terms

Move to the next level! Check out the following terms.

Electromagnetic radiation

Electromagnetic radiation is a type of energy that is commonly known as light. Detached from its source, it is transported by electromagnetic waves (or by their quanta, particles called photons) and propagates through space.

  • Electromagnetic radiation includes radio waves, microwaves, infrared, (visible) light, ultraviolet, X-rays, and gamma rays.
  • Electromagnetic radiation is sometimes called EM radiation or electromagnetic radiant energy (EMR).
  • All forms of electromagnetic radiation can be described in terms of both waves or particles.
  • All forms of electromagnetic radiation travel at 299,792 kilometres per second in a vacuum.

Electromagnetic wave

An electromagnetic wave carries electromagnetic radiation.

Photon

Electromagnetic waves are carried by particles called photons.

Sunlight

Sunlight is light emitted by the Sun and is also called daylight or visible light.

Visible light

Visible light is a form of electromagnetic radiation.

More Information

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Diagrams available for download from lightcolourvision.org share common specifications:
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  • Backgrounsd SVG: White.
  • Backgrounsd PNG: Transparent.
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  • Labels: Calibri 24pt Italic.
  • Diagrams are available in three file formats: SVG, PNG, AI.

Diagrams (white/transparent backgrounds) are optimized for printing on A4 pages in portrait format.

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  • Text on SVG images with white (or transparent) backgrounds use Calibri 24pt Italic.

Did you know:

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