(electromagnetic radiation, frequency 300MHz to 300GHz)
Microwave is electromagnetic radiation (EMR) with wavelength
in the range of 1mm to 1m (frequency 300MHz to 300GHz).
It comprises the shortest radio waves, adjacent to infrared.
The terms microwave astronomy and microwave radio astronomy
are occasionally used and the more common term, millimeter astronomy
spans the border between microwave and infrared.
The atmosphere blocks much microwave EMR from
reaching Earth, and space observatories have been
used. However, the long-wavelength end of microwave
is within the radio atmospheric window, multiple narrow windows allow
some shorter microwaves through, and high-altitude observatories
allow microwave telescopes to sense more signal.
Some microwave sources, i.e., the subjects of microwave astronomy:
Some mechanisms by which microwave is produced:
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Atacama Cosmology Telescope (ACT)
anomalous microwave emission (AME)
Atacama Pathfinder Experiment (APEX)
cosmic background radiation (CBR)
Cosmic Lens All-sky Survey (CLASS)
cosmic microwave background (CMB)
Cosmic Background Explorer (COBE)
fast radio burst (FRB)
low frequency radio astronomy
Large Millimeter Telescope (LMT)
NRAO VLA Sky Survey (NVSS)
Plateau de Bure Interferometer (PdBI)
Submillimeter Telescope (SMT)
South Pole Telescope (SPT)
Sunyaev-Zel'dovich Array (SZA)