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Size (left) and distance (right) of a few well-known galaxies put to scale. There are an estimated 100 billion galaxies in all of the observable universe. [1] On the order of 100,000 galaxies make up the Local Supercluster, and about 51 galaxies are in the Local Group (see list of nearest galaxies for a complete list).
For instance, Markarian galaxies, named after Benjamin Markarian, are galaxies with excess blue and ultraviolet emission; [5] galaxies in the Atlas of Peculiar Galaxies are assigned an Arp number after Halton Arp who produced the catalog; etc. Objects in these catalogs are excluded below, except in cases where they carry the name of an ...
Science's first foray into dramatic programming, its premiere on the channel will be simulcast on sister network Discovery Channel. [2] The Critical Eye – An eight-part series examining pseudoscientific and paranormal phenomena. Dinosaur Revolution – A four-part miniseries on the natural history of dinosaurs. The last two episodes were ...
The fourth season premiered on July 14, 2015, as part of the Science Channel's "Space Week," in honor of New Horizons' flyby of Pluto that day; the season ran through September 1, 2015. The show's fifth season aired from November 22, 2016, through February 7, 2017.
2013 – The galaxy Z8 GND 5296 is confirmed by spectroscopy to be one of the most distant galaxies found up to this time. Formed just 700 million years after the Big Bang, expansion of the universe has carried it to its current location, about 13 billion light years away from Earth (30 billion light years comoving distance). [18]
A comet is named after its first independent discoverers, up to a maximum of three names, separated by hyphens. [ 30 ] [ 31 ] The IAU prefers to credit at most two discoverers, and it credits more than three discoverers only when "in rare cases where named lost comets are identified with a rediscovery that has already received a new name."
A look at real life "death stars" that are far worse than the one in Star Wars such as supernovas that unleash massive gamma-ray bursts (GRB) that could eradicate all life for thousands of light years; a look at "WR 104", a dying star 8000 light years away that could point a GRB right at Earth, and "3C 321", a "death star galaxy" that could be ...
Many dwarf galaxies may orbit a single larger galaxy; the Milky Way has at least a dozen such satellites, with an estimated 300–500 yet to be discovered. [107] Most of the information we have about dwarf galaxies come from observations of the local group, containing two spiral galaxies, the Milky Way and Andromeda, and many dwarf galaxies.