(electromagnetic radiation, frequency 300MHz to 300GHz)
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 term microwave astronomy
is occasionally used and millimeter astronomy
spans the border between microwave and infrared.
The atmosphere blocks much microwave EMR from
reaching Earth, and some space observatories have been
used. However, the long-wavelength end of microwave
is within the radio atmospheric window, narrow windows allow some
shorter microwaves through, and high altitudes are used
for microwave observatories to sense more signal.
Targets of study include the cosmic microwave background which has motivated
three space observatories, as well as the 21cm line.
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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)