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1989 – Margaret Geller and John Huchra discover the "Great Wall", a sheet of galaxies more than 500 million light years long and 200 million wide, but only 15 million light years thick. 1990 – Michael Rowan-Robinson and Tom Broadhurst discover that the IRAS galaxy IRAS F10214+4724 is the brightest known object in the Universe.
Tadpole Galaxy: Draco: The name comes from the resemblance of the galaxy to a tadpole. [citation needed] This shape resulted from tidal interaction that drew out a long tidal tail. [citation needed] Topsy Turvy Galaxy: Reticulum: The disorganized and chaotic appareance makes it look topsy turvy. [citation needed] Triangulum Galaxy: Triangulum
A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek galaxias, literally 'milky', a reference to the Milky Way galaxy that contains the Solar System.
Galaxies are finally recognized as objects beyond the Milky Way, and the Milky Way as a galaxy proper. [88] 1922 – Vesto Slipher summarizes his findings on the spiral nebulae's systematic redshifts. 1922 – Alexander Friedmann finds a solution to the Einstein field equations which suggests a general expansion of space.
The timeline of the Universe lists events from its creation to its ultimate final state. For a timeline of the universe from the present to its presumed conclusion, see: Timeline of the far future; Chronology of the universe; Timeline of the universe
This is a timeline of space exploration which includes notable achievements, first accomplishments and milestones in humanity's exploration of outer space. This timeline generally does not distinguish achievements by a specific country or private company, as it considers humanity as a whole.
Void name/designation Maximum dimension (in light-years) Notes LOWZ North 13788 void: 2,953,000,000: One of largest known voids, containing 109,066 known galaxies. [29] Local Hole: 2,000,000,000: Proposed void containing the Milky Way galaxy and Local Group as an explanation for the discrepancy in the Hubble constant. Existence is still ...
1982 — IRAS space observatory completes an all-sky mid-infrared survey; 1990 — Publication of APM Galaxy Survey of 2+ million galaxies, to study large-scale structure of the cosmos; 1991 — ROSAT space observatory begins an all-sky X-ray survey; 1993 — Start of the 20 cm VLA FIRST survey