Of all the different types of radiation that are emitted from stars and galaxies, only radio waves and visible light manage to penetrate our Earth's atmosphere unimpeded. To observe other forms of radiation (gamma rays, X-rays, ultraviolet or infrared rays), special satellites, or observatories built on very high, dry mountains must be used.

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Comments and inquiries to:
Russ Taylor: (russ@ras.ucalgary.ca)
Bill Scott: (bill at ras.ucalgary.ca)