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Cosmos Redshift 7 (also known as COSMOS Redshift 7, Galaxy Cosmos Redshift 7, Galaxy CR7 or CR7) is a high-redshift Lyman-alpha emitter galaxy. At a redshift z = 6.6, [ 1 ] the galaxy is observed as it was about 800 million years after the Big Bang , during the epoch of reionisation . [ 1 ]
Encyclopedia Galactica is the name of a number of fictional or hypothetical encyclopedias containing all the knowledge accumulated by a galaxy-spanning civilization, most notably in Isaac Asimov's Foundation series. The concept of a "future encyclopedia" has become "something iconic among many lovers of the science fiction", and has been reused ...
A compendium may concisely summarize a larger work. In most cases, the body of knowledge will concern a specific field of human interest or endeavour (for example: hydrogeology , logology , ichthyology , phytosociology or myrmecology ), while a general encyclopedia can be referred to as a compendium of all human knowledge .
NGC 4151 is an intermediate spiral Seyfert galaxy with weak inner ring structure located 15.8 megaparsecs (52 million light-years) from Earth [4] in the constellation Canes Venatici. The galaxy was first mentioned by William Herschel on March 17, 1787; it was one of the six Seyfert galaxies described in the paper [ 5 ] which defined the term.
NGC 4731 is a barred spiral galaxy located near the Virgo Supercluster. To its celestial south lies NGC 4731A, a small irregular galaxy. [2] Both galaxies feature high concentrations of neutral HI gas. [3] It is theorized that its elongated arm structure could be related to gravitational interactions with a nearby galaxy, NGC 4967.
It contains 29,418 galaxies and 9,134 galaxy clusters. [1] [2] Gallery. I Zwicky 18. I Zwicky 32, a face-on spiral galaxy in the constellation Canes Venatici.
Messier 77 (M77), also known as NGC 1068 or the Squid Galaxy, is a barred spiral galaxy in the constellation Cetus. It is about 47 million light-years (14 Mpc ) away from Earth, and was discovered by Pierre Méchain in 1780, who originally described it as a nebula.
NGC 891 (also known as Caldwell 23, the Silver Sliver Galaxy, and the Outer Limits Galaxy) is an edge-on unbarred spiral galaxy about 30 million light-years away in the constellation Andromeda. It was discovered by William Herschel on October 6, 1784. [3] The galaxy is a member of the NGC 1023 group of galaxies in the Local Supercluster.