Radio astronomy

thumb|upright=1.35|Artist's image of the accretion disc in ULAS J1120+0641, a very distant quasar containing a supermassive black hole with a mass two billion times that of the Sun thumb|The Chandra X-ray Observatory|Chandra X-ray image of [[PKS 1127-145, a quasar about 10 billion light-years from Earth. An X-ray jet extends at least a million light-years from the quasar. Image is 60 arcseconds on a side. RA 11h 30m 7.10s Dec −14° 49' 27" in Crater. Observation date: May 28, 2000. Instrument: ACIS]]

thumb|right|223x223px|PSR B1509−58 – [[X-rays from Chandra are gold; infrared from WISE in red, green and blue/max.]] thumb|right|Animation of a rotating pulsar. The sphere in the middle represents the neutron star, the curves indicate the magnetic field lines and the protruding cones represent the emission zones. thumb|Illustration of the "lighthouse" effect produced by a pulsar

electromagnetic radiation as a remnant from an early stage of the universe in Big Bang cosmology

subfield of astronomy that studies celestial objects at radio frequencies

effort to find civilizations not from Earth

network of spacecraft communication facilities operated by NASA

high-energy astrophysical phenomenon manifested as a transient radio pulse lasting only a few milliseconds

spectral line of hydrogen state transitions

type of astronomical interferometry used in radio astronomy

The jansky (symbol Jy, plural janskys) is a non-SI unit of spectral flux density, or spectral irradiance, used especially in radio astronomy. It is equivalent to 10−26 watts per square metre per hertz.

distortion of cosmic microwave background in galaxy clusters

pulsar with a binary companion, often a white dwarf or neutron star

purported correlation of the cosmic microwave background with the Earth’s ecliptic

mixing signals from many telescopes to produce images with high angular resolution

naturally occurring source of stimulated spectral line emission, typically in the microwave portion of the electromagnetic spectrum

specific land area in which radio transmissions are heavily restricted

network of spacecraft communication facilities operated by China

unexplained circular astronomical object detected only by radio waves

temperature associated with the measured intensity and frequency

measure of the dependence of radiative flux density on frequency (astronomical term)

high-energy astrophysical process

short radio signals of terrestrial origin

area where radio transmissions are restricted in order to protect a radio telescope or a communications station from radio frequency interference

aspect of the history of modern physical cosmology

straying of waves in the radio and electromagnetic spectrums outside their allocations that cause problems for some activities, of particular concern to radio astronomers

consortium of astronomers

institute of the Russian Academy of Sciences

research institute in Saint Petersburg, Russia