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These galaxies may or may not include a central non-disc-like region (a galactic bulge). [2] They will typically have an orbiting mass of gas and dust in the same plane as the stars. Interactions with other nearby galaxies can perturb and stretch the galactic disk. Disc galaxy types include: Spiral galaxies: Unbarred spiral galaxies: (types S, SA)
In the 1980s, the Lyons Groups of Galaxies listed 485 galaxy groups with 3,933 member galaxies. Galaxy Zoo is a project aiming at a more comprehensive list: launched in July 2007, it has classified over one million galaxy images from The Sloan Digital Sky Survey, The Hubble Space Telescope and the Cosmic Assembly Near-Infrared Deep ...
Abd al-Aziz with his bicycle, published in La Vie illustrée [] 1901.. Moulay Abd al-Aziz bin Hassan (Arabic: عبد العزيز بن الحسن), born on 24 February 1881 in Marrakesh and died on 10 June 1943 in Tangier, [1] [2] was a sultan of Morocco from 9 June 1894 to 21 August 1908, as a ruler of the 'Alawi dynasty.
1750 – Thomas Wright discusses galaxies and the flattened shape of the Milky Way and speculates nebulae as separate. [11] 1755 – Immanuel Kant drawing on Wright's work conjectures that our galaxy is a rotating disk of stars held together by gravity, and that the nebulae are separate such galaxies; he calls them Island Universes.
Hassan II studying at the Royal College in 1943. Mawlay al-Hassan bin Mohammed bin Yusef al-Alawi was born on 9 July 1929 at the Dar al-Makhzen in Rabat, during the French protectorate in Morocco, as the eldest son to Sultan Mohammed V and his second wife, Lalla Abla bint Tahar, as a member of the 'Alawi dynasty.
Four of the seven members of galaxy group HCG 16 [1]. A galaxy group [2] or group of galaxies [3] (GrG [4]) is an aggregation of galaxies comprising about 50 or fewer gravitationally bound members, each at least as luminous as the Milky Way (about 10 10 times the luminosity of the Sun); collections of galaxies larger than groups that are first-order clustering are called galaxy clusters. [5]
In ancient times, only the Sun and Moon, a few stars, and the most easily visible planets had names. Over the last few hundred years, the number of identified astronomical objects has risen from hundreds to over a billion, and more are discovered every year.
An artist's concept of a planetary system. A planetary system is a set of gravitationally bound non-stellar bodies in or out of orbit around a star or star system.Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, comets, planetesimals [1] [2] and ...