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The Triangulum Galaxy is a spiral galaxy 2.73 million light-years (ly) from Earth in the constellation Triangulum.It is catalogued as Messier 33 or NGC 598.With the D 25 isophotal diameter of 18.74 kiloparsecs (61,100 light-years), the Triangulum Galaxy is the third-largest member of the Local Group of galaxies, behind the Andromeda Galaxy and the Milky Way.
Neutron stars are thought to have high rigidity in the crust, and thus a low Love number: ; [6] [7] isolated, nonrotating black holes in vacuum have vanishing Love numbers for all multipoles =. [ 8 ] [ 9 ] [ 10 ] Measuring the Love numbers of compact objects in binary mergers is a key goal of gravitational-wave astronomy .
33 is the 21st composite number, and 8th distinct semiprime (third of the form where is a higher prime). [1] It is one of two numbers to have an aliquot sum of 15 = 3 × 5 — the other being the square of 4 — and part of the aliquot sequence of 9 = 3 2 in the aliquot tree (33, 15, 9, 4, 3, 2, 1).
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Cover of Weird Tales issue of October 1939, where the story first appeared. "In the Walls of Eryx" is a short story by American writers H. P. Lovecraft and Kenneth J. Sterling, [1] written in January 1936 and first published in Weird Tales magazine in October 1939. It is a science fiction story involving space exploration in the near future.
Analysis of historical records show that Romano's Star was likely quiescent from 1900 until five outbursts occurred between 1960 and 2010. The brightness is not constant during maximum but shows variations on a timescale of months. The third of the five outbursts was the brightest, peaking at magnitude 16.5. [2]
[2] [3] The spacecraft in the latter reaches its destination in less than a decade but has the capacity to function as a generation starship if needed; the use of an actual generation starship headed for the system was later depicted in the 1944 novel Far Centaurus by A. E. van Vogt, [32] [33] and the 1997 novel Alpha Centauri by William Barton ...