We any patch of the sky is observed where no individual
sources can be discerned, and the effects of the
interplanetary dust, and interstellar matter are taken into
account, there is still is radiation,
this radiation is known as
Cosmic Background Radiation.
The origen of this radiation depends on the region of the
spectrum that we are observing. Certainly the most famous
component is the
Cosmic microwave background radiation,
a reminder of epoch where the universe, still hot, became
transparent for the first time to radiation.
The are also background in the infrared, x-rays, etc., with
different causes, and most of them ultimately reducible to
unresolved individual sources.
/Talk
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