[3] Astronomers first began to conjecture that the Milky Way is a barred spiral galaxy, rather than an ordinary spiral galaxy, in the 1960s. [212][213] In another version of the story, Athena, the patron goddess of heroes, tricked Hera into suckling Heracles voluntarily,[212][213] but he bit her nipple so hard that she flung him away, spraying milk everywhere. Stars and gases at a wide range of distances from the Galactic Center orbit at approximately 220 kilometers per second. With this technique, the age of the globular cluster M4 was estimated as 12.7 ± 0.7 billion years. It is a fairly typical barred spiral with four major arms in its disk, at least one spur, and a newly discovered outer arm. About 40% of the Milky Way's clusters are on retrograde orbits, which means they move in the opposite direction from the Milky Way rotation. From Sagittarius, the hazy band of white light appears to pass around to the galactic anticenter in Auriga. Lo facevano in passato gli Italiani per cercare lavoro oltralpe e oggi lo fanno i migranti africani che continuano il loro viaggio in Europa per cercare di fuggire dalla loro misera condizione. [32][33] To compare the relative physical scale of the Milky Way, if the Solar System out to Neptune were the size of a US quarter (24.3 mm (0.955 in)), the Milky Way would be approximately the size of the contiguous United States. The Milky Way is the galaxy that contains our Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye. Durata 84 minuti. Galileo Galileifirst resolved the band of lig… He became a proponent of the "island universes" hypothesis, which held that the spiral nebulae were independent galaxies. Astronomers believe the Milky Way is moving at approximately 630 km/s (1,400,000 mph) with respect to this local co-moving frame of reference. [126][129] This observation suggests that the Milky Way possesses only two major stellar arms: the Perseus arm and the Scutum–Centaurus arm. For observers from latitudes approximately 65° north to 65° south, the Milky Way passes directly overhead twice a day. Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area. The stars in the innermost 10,000 light-years form a bulge and one or more bars that radiate from the bulge. About 13.5 billion-years-old, 2MASS J18082002-5104378 B is a tiny ultra metal-poor (UMP) star made almost entirely of materials released from the Big Bang, and is possibly one of the first stars. [31] A different January 2013 analysis of Kepler data estimated that at least 17 billion Earth-sized exoplanets reside in the Milky Way. [200][failed verification] The Milky Way is moving in the general direction of the Great Attractor and other galaxy clusters, including the Shapley supercluster, behind it. The proposed likely interpretation is that a dwarf galaxy is merging with the Milky Way. One such frame of reference is the Hubble flow, the apparent motions of galaxy clusters due to the expansion of space. [124] Estimates of the pitch angle of the arms range from about 7° to 25°. [citation needed], In western culture, the name "Milky Way" is derived from its appearance as a dim un-resolved "milky" glowing band arching across the night sky. [196], In January 2006, researchers reported that the heretofore unexplained warp in the disk of the Milky Way has now been mapped and found to be a ripple or vibration set up by the Large and Small Magellanic Clouds as they orbit the Milky Way, causing vibrations when they pass through its edges. 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