Astronomical events

hypothetical begin of the Universe through expansion out of an infinitely small and infinitely dense state

A lunar eclipse, also called a blood moon, is an astronomical event that occurs when the Moon orbits through Earth's shadow.‍‍ Lunar eclipses occur during eclipse season, when the Moon's orbital plane is approximately in line with Earth and the Sun. The type and length of a lunar eclipse depend on the Moon's proximity to the lunar node.‍‍

thumb|Totality during the solar eclipse of August 11, 1999, showing the [[solar corona and prominences]] thumb|The lunar umbra on Earth during the solar eclipse of August 21, 2017, as seen from space

frame|right|Artist's conception of a white dwarf, right, Accretion (astrophysics)|accreting hydrogen from the [[Roche lobe of its larger companion star]]

thumb|alt=refer to caption|A juxtaposition of the apparent diameters of a more-average full moon on December 20, 2010 (left), and of the supermoon of March 19, 2011 (right) as viewed from Earth

theory of rapid universe expansion

flashes of gamma rays from distant galaxies

thumb|200px|In this July 1997 still frame captured from video, the bright star Aldebaran has just reappeared on the dark limb of the waning crescent moon in this predawn occultation.

phenomenon when a celestial body passes directly between a larger body and the observer

thumb|upright=1.4|European Southern Observatory|ESO image of hypernova [[SN 1998bw in a spiral arm of galaxy ESO 184-G82]] A hypernova is a very energetic supernova which is believed to result from an extreme core collapse scenario. In this case, a massive star (>30 solar masses) collapses to form a rotating black hole emitting twin astrophysical jets and surrounded by an accretion disk. It is a type of stellar explosion that ejects material with an unusually high kinetic energy, an order of magnitude higher than most supernovae, with a luminosity at least 10 times greater. Hypernovae release

collision of two astronomical objects with measurable effects

straight-line configuration of three celestial bodies in astronomy

expected future collision between the Andromeda Galaxy and the Milky Way Galaxy

thumb|290px|Artist's impression of a micronovaA micronova is a putative type of thermonuclear explosion on the surface of a white dwarf much smaller than the strength of a nova; being about in strength, about a millionth that of a typical nova. The phenomenon was first described in April 2022.

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

thumb|upright=1.4|Artist's impression of neutron stars merging, producing gravitational waves and resulting in a kilonova

Exceptionally bright comets

cataclysmic variable star, consisting of a close binary star system

astronomical object emitting bursts of gamma-rays and X-rays at irregular intervals

brightening of a rough surface, when illuminated from directly behind the observer

stellar explosion

a term in Chinese astronomy where a star which has suddenly appeared in a place where no star had previously been observed and becomes invisible again after some time

physical phenomenon caused by light reflected off surfaces distant from the source, and arriving at the observer with a delay relative to this distance; analogous to an echo of sound, it mostly only manifests itself over astronomical distances

pulling apart of a star by tidal forces when it gets too close to a supermassive black hole

study of how astronomical objects change with time

high-energy astrophysical process

phenomenon in radio astronomy

energetic non-quasar transient astronomical event

powerful stream of charged particles that can push interstellar dust clouds of low density into intergalactic space