Knowra Electromagnetic astronomy Electromagnetic astronomy Electromagnetic astronomy studies celestial objects and phenomena through the electromagnetic radiation they emit, absorb, or reflect, across the spectrum from radio waves to gamma rays.
Electromagnetic spectrum : The full range of electromagnetic radiation, ordered by wavelength or frequency. Its wavelength bands organize the observations that define this branch of astronomy.
Astronomical observatory : A facility equipped to observe astronomical objects, often with one or more telescopes. Observatories provide the instruments and conditions needed for electromagnetic measurements.
Radio astronomy : The study of celestial objects through radio-frequency electromagnetic radiation. Radio observations map cold gas, pulsars, and synchrotron-emitting particles.
Gravitational-wave astronomy : The study of astronomical sources through ripples in spacetime produced by accelerating masses. It detects cosmic events through spacetime disturbances rather than electromagnetic radiation.
Crab Nebula : A supernova remnant in Taurus powered by a rapidly rotating neutron star. Its emission across the spectrum connects a pulsar to nebular radiation.
Blackbody radiation : Electromagnetic radiation emitted by an ideal object whose spectrum depends only on its temperature. Thermal spectra let astronomers infer temperatures of stars, planets, and dust.
Radio telescope : A telescope designed to detect and analyze radio-frequency electromagnetic radiation from space. Radio instruments reveal emission unavailable to visible-light telescopes.
Infrared astronomy : The study of celestial objects through infrared radiation. Infrared observations reveal cool objects and regions obscured by interstellar dust.
Neutrino astronomy : The study of cosmic sources through neutrinos, weakly interacting subatomic particles. Neutrinos can escape dense regions that absorb or scatter electromagnetic signals.
Sagittarius A* : The compact radio source at the center of the Milky Way, associated with its central supermassive black hole. Observations at radio, infrared, and X-ray wavelengths probe its surroundings and activity.
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