#BAFact: Our air is transparent to visible light and radio waves, but absorbs most other kinds of light.* 

We think of Earth's air as being invisible. But it's actually only transparent to visible light - the kind we see with - and radio waves. It absorbs almost every other flavor of light, which is one reason we put observatories on mountain tops, and use balloons and satellites to observe using X-rays, gamma-rays, ultraviolet, and infrared.

More: http://outreach.atnf.csiro.au/education/senior/astrophysics/wavebands.html

Image: DRAO
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