19 dec2020
milky way galaxy planets
[188] Recent analysis of the chemical signatures of thousands of stars suggests that stellar formation might have dropped by an order of magnitude at the time of disk formation, 10 to 8 billion years ago, when interstellar gas was too hot to form new stars at the same rate as before. Our Sun lies near a small, partial arm called the Orion Arm, or Orion Spur, located between the Sagittarius and Perseus arms. The annotated artist's concept illustrates the new view of the Milky Way. The term Milky Way is a translation of the Latin via lactea, from the Greek γαλαξίας κύκλος (galaxías kýklos, "milky circle"). [34], The Milky Way has several satellite galaxies and is part of the Local Group of galaxies, which form part of the Virgo Supercluster, which is itself a component of the Laniakea Supercluster.[35][36]. The orbital speed of the Solar System about the center of the Milky Way is approximately 220 km/s (490,000 mph) or 0.073% of the speed of light. [158] The Sun, and thus the Solar System, is located in the Milky Way's galactic habitable zone. The Far 3 kpc Arm was discovered in 2008 by astronomer Tom Dame (Harvard–Smithsonian CfA). [139], It has been suggested that the Milky Way contains two different spiral patterns: an inner one, formed by the Sagittarius arm, that rotates fast and an outer one, formed by the Carina and Perseus arms, whose rotation velocity is slower and whose arms are tightly wound. [29] Besides exoplanets, "exocomets", comets beyond the Solar System, have also been detected and may be common in the Milky Way. [90], Outside the gravitational influence of the Galactic bar, the structure of the interstellar medium and stars in the disk of the Milky Way is organized into four spiral arms. This topographical map of Ceres, made with images from NASA's Dawn spacecraft, shows all of the dwarf planet's named features as of September 2016. The term is a translation of the Classical Latin via lactea, in turn derived from the Hellenistic Greek γαλαξίας, short for γαλαξίας κύκλος (galaxías kýklos, "milky circle"). Thus, to compare the Milky Way to the Hubble flow, one must consider a volume large enough so that the expansion of the Universe dominates over local, random motions. [105][116][117] The bar may be surrounded by a ring called the "5-kpc ring" that contains a large fraction of the molecular hydrogen present in the Milky Way, as well as most of the Milky Way's star formation activity. [21] Following the 1920 Great Debate between the astronomers Harlow Shapley and Heber Curtis,[22] observations by Edwin Hubble showed that the Milky Way is just one of many galaxies. [119], In 2010, two gigantic spherical bubbles of high energy emission were detected to the north and the south of the Milky Way core, using data from the Fermi Gamma-ray Space Telescope. In simulated galaxies with similar properties, star formation will typically have been extinguished within about five billion years from now, even accounting for the expected, short-term increase in the rate of star formation due to the collision between both the Milky Way and the Andromeda Galaxy. [25], Estimates of the mass of the Milky Way vary, depending upon the method and data used. Here Are 300 Million, Maybe - A new analysis of data from NASA's Kepler spacecraft increases the number of habitable exoplanets thought to exist in this galaxy", "Release 15-001 – NASA's Chandra Detects Record-Breaking Outburst from Milky Way's Black Hole", Interpretation of velocity distribution of the inner regions of the Galaxy, Models for the inner regions of the Galaxy. Selbstverständlich ist jeder Milky way galaxy map planets direkt auf Amazon.de im Lager verfügbar und kann sofort bestellt werden. [15] The Milky Way as a whole is moving at a velocity of approximately 600 km per second with respect to extragalactic frames of reference. [64] An exact figure would depend on counting the number of very-low-mass stars, which are difficult to detect, especially at distances of more than 300 ly (90 pc) from the Sun. This is an image of the planet Uranus taken by the spacecraft Voyager 2 on January 14th 1986 from a distance of approximately 7.8 milllion miles ( 12.7 million km ). The rotation curve (shown in the figure) describes this rotation. This arm is shorter than the two major arms and lies along the bar of the galaxy. At least three of Dôn's children also have astronomical associations: Caer Gwydion ("The fortress of Gwydion") is the traditional Welsh name for the Milky Way,[209][210] and Caer Arianrhod ("The Fortress of Arianrhod") being the constellation of Corona Borealis. [58] The explanation for this apparent discrepancy is unclear. 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