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ExploraTour - Looking at the World in a Different Light - Windows to the Universe

Shop Windows to the Universe

We now offer the Cool It! card game in our Science Store. Cool It! is the new card game from UCS that teaches kids about the choices we have when it comes to climate change.

ExploraTour - Looking at the World in a Different Light


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Windows to the Universe original artwork.

Visible light is only a small portion of the sea of radiant energy that bathes the Earth. The rest is invisible and can be measured using electronic devices or photographic films. All forms of radiant energy can be identified by their frequency, wavelength and the energy they carry. Every wavelength of radiation carries a fixed amount of energy. Each behaves as if it were a stream of particles or energy packets called "photons". The shorter the wavelength (higher the frequency), the more energy each photon carries. Ultraviolet photons carry up to 1000 times more energy than visible light photons. X-ray photons carry up to 100 times more energy than ultraviolet photons and gamma rays can carry up to 100 times more energy than x-rays. That is why gamma rays can travel through metal and the x-rays the doctor uses can pass through the soft tissue in your body.


Shop Windows to the Universe Science Store!

Our online store includes issues of NESTA's quarterly journal, The Earth Scientist, full of classroom activities on different topics in Earth and space science, as well as books on science education!

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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF