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16 relations: Black hole, Gamma-ray burst, Gravitational wave, N6946-BH1, NGC 3021, NGC 6946, Red supergiant star, Solar mass, Stellar black hole, Supergiant star, Superluminous supernova, Supernova, Supernova impostor, Time domain astronomy, Transient astronomical event, Universe Today.
Black hole
A black hole is a region of spacetime exhibiting such strong gravitational effects that nothing—not even particles and electromagnetic radiation such as light—can escape from inside it.
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Gamma-ray burst
In gamma-ray astronomy, gamma-ray bursts (GRBs) are extremely energetic explosions that have been observed in distant galaxies.
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Gravitational wave
Gravitational waves are the disturbance in the fabric ("curvature") of spacetime generated by accelerated masses and propagate as waves outward from their source at the speed of light.
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N6946-BH1
N6946-BH1 is a disappearing red supergiant star in another galaxy, NGC 6946, on the northern border of the constellation of Cygnus.
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NGC 3021
NGC 3021 is a small spiral galaxy in the constellation Leo Minor.
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NGC 6946
NGC 6946 is a face-on intermediate spiral galaxy with a small bright nucleus, whose location in the sky straddles the boundary between the northern constellations of Cepheus and Cygnus.
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Red supergiant star
Red supergiants are stars with a supergiant luminosity class (Yerkes class I) of spectral type K or M. They are the largest stars in the universe in terms of volume, although they are not the most massive or luminous.
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Solar mass
The solar mass is a standard unit of mass in astronomy, equal to approximately.
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Stellar black hole
A stellar black hole (or stellar-mass black hole) is a black hole formed by the gravitational collapse of a massive star.
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Supergiant star
Supergiants are among the most massive and most luminous stars.
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Superluminous supernova
A superluminous supernova (SLSN, plural superluminous supernovae or SLSNe; also known as hypernova) is a type of stellar explosion with a luminosity 10 or more times higher than that of standard supernovae.
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Supernova
A supernova (plural: supernovae or supernovas, abbreviations: SN and SNe) is a transient astronomical event that occurs during the last stellar evolutionary stages of a star's life, either a massive star or a white dwarf, whose destruction is marked by one final, titanic explosion.
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Supernova impostor
Supernova impostors are stellar explosions that appear at first to be a type of supernova but do not destroy their progenitor stars.
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Time domain astronomy
Time domain astronomy is the study of how astronomical objects, especially those beyond the Solar System, change with time.
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Transient astronomical event
A transient astronomical event, often shortened by astronomers to a transient, is an astronomical object or phenomenon whose duration may be from seconds to days, weeks, or even several years.
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Universe Today
Universe Today (UT) is a popular North American-based non-commercial space and astronomy news website.
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