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infrared light

What Is Infrared?
 

What Is Infrared?

If an object has any temperature at all, it gives off waves in the infrared (IR) part of the electromagnetic spectrum. We feel IR light as heat. And with special equipment we can even see it.

IR cameras reveal hidden stars, camouflaged animals, criminals who think they are concealed by darkness, and much more. Take a closer look.

Caltech
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The Electromagnetic Spectrum

The Electromagnetic Spectrum

Still unsure which wavelengths belong where on the electromagnetic spectrum, or what their uses are? Then don't miss this animation and quiz. More...

Interactive
BBC
The Herschel Experiment

The Herschel Experiment

In 1800, the astronomer Frederick William Herschel proved there was a kind of light we couldn’t see. You can perform a version of Herschel’s famous experiment. More...

Activity
Caltech
Infrared Camera Sees Through Stardust to the Edge of the Universe

Infrared Camera Sees Through Stardust to the Edge of the Universe

What happens in space no longer stays in space. Technology allows humans to see what's happening trillions of miles from Earth: space tornadoes, the birth of new stars, and the deaths of old ones. More...

Article
PBS NewsHour
Infrared Galleries

Infrared Galleries

Does a ball look the same before and after being bounced? Not if you see it in infrared light. Here are scads of surprising IR images. More...

Images
Caltech
Infrared Waves

Infrared Waves

Pointed into space, IR cameras see behind dust clouds. Pointed at Earth, they show global warming and the health of crops. Pointed at your TV, IR light turns it on! More...

Article
NASA
Infrared: More than Your Eyes Can See

Infrared: More than Your Eyes Can See

By showing the heat an object radiates, infrared images allow us to see in the dark, and through smoke. They may even reveal planets orbiting distant stars. More...

Video
NASA
Light Facts

Light Facts

Did you know light travels at different speeds through different materials? A snack of facts awaits you here. More...

Article
Science Kids
Pigments Through the Ages

Pigments Through the Ages

Hidden details are revealed when we look at ancient paintings and manuscripts with equipment that lets us see infrared light.

More...

Article
Webexhibits.org
Radiant Energy

Radiant Energy

Why is the pupil of the eye black, a greenhouse warm, and the planet Venus hot enough to melt lead? Paul Hewitt comes up with just the right pictures and words to explain radiant energy.
More...

Video
Hewitt-Drew-it!
The Earth’s Radiation Budget

The Earth’s Radiation Budget

To understand climate change, scientists must understand how water vapor, carbon dioxide, particles in the air, infrared radiation, and other factors are working together to warm the planet. More...

Article
NASA
Ultraviolet Radiation and Infrared Radiation

Ultraviolet Radiation and Infrared Radiation

Ultraviolet and infrared radiation are different wavelengths in the electromagnetic spectrum. UV radiation has a shorter wavelength than visible light, while Infrared has a longer wavelength. More...

Article
BBC
Up All Night with SOFIA, NASA’s Flying Observatory

Up All Night with SOFIA, NASA’s Flying Observatory

Find out why NASA has a flying infrared telescope, and what it shows us that other observatories can't. More...

Video
QUEST

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