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[Music]

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how do you make sense of something you

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can't see

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this is the electromagnetic spectrum

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where light travels in waves without it

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the world you know could not exist the

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human eye can only see this very small

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part of the spectrum

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called visible light but a whole new

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universe is revealed by looking through

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the infrared infrared light can't be

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seen but it can be felt in the form of

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heat every objects whether hot or cold

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gives off heat special thermal cameras

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use colors to show us if something is

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warm or cold some objects are hot enough

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to show visible lights and things that

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are too cold to be seen by the naked eye

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can let off in infrared such as your

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body or this cup of coffee

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ir light can be used in very practical

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ways longer IR waves can cook your

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dinner shorter IR waves that are used in

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your TV's remote control and firemen use

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IR cameras to see through smoke to find

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people trapped in a fire so how does

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this apply to a telescope on top of

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showing us colder objects infrared

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wavelengths can see through large

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amounts of gas and dust lifting the veil

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to what lies on the other side Spitzer

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sees objects like exoplanets or the

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Milky Way by looking at their infrared

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glow from the heat they give off this

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gives us the ability to see what is