Dr. Marks was operating a submillimeter telescope, which observes radiation from gas clouds around star-forming regions in space.

Both arrays are used to observe radiation with frequencies between 12 and 18 GHz, and have very similar system designs.

It observes radiation between 20 keV and 8 MeV.

The initial detection of radio waves from an astronomical object was made in the 1930s, when Karl Jansky observed radiation coming from the Milky Way.

They were intended to observe various radiation and magnetic phenomena in the ionosphere and beyond.

Indeed, we do observe radiation of the general nature that we would expect.

The Unruh effect, described by Unruh in 1976, is the prediction that an accelerating observer will observe black-body radiation where an inertial observer would observe none.

During World War II, on 25 and 26 February 1942, British radar operators observed radiation that Stanley Hey interpreted as solar emission.

This is why infrared telescopes are placed on high, dry mountains (like Mauna Kea in Hawaii) so that they can observe more infrared radiation.

An observer at a lower gravitational potential than a source ("downhill") will observe radiation to be blueshifted to shorter wavelengths.