Observations at
other Wavelengths

Note the concept of an "atmospheric window", as summarized in the following figure.

Except for visible and rf frequency ranges, the atmosphere absorbs very strongly and serious astronomy at other wavelengths requires observations from orbiting platforms above the Earth's atmosphere.

The ability to routinely put such observatories in orbit has led to entirely new fields of astronomy devoted to observations at wavelengths other than visible. The following table summarizes some of the characteristic phenomena that are studied at various wavelengths.

Characteristic Object
Compact objects in collision (neutron stars, ...)?
Neutron stars
Hot stars, quasars
Red giant stars, galactic nuclei
Protostars, dust, planets
Cold dust, molecular clouds
cm Radio
HI 21-cm line, pulsars

Here is a link to NASA SkyView, which allows you to obtain views of different parts of the sky at different wavelengths.

This link to an example of the Trifid Nebula as seen at a normal range of wavelengths and through a filter that passes only light near the H-alpha Balmer frequency illustrates dramatically the observational differences at different wavelengths.