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It should be visible if the limiting magnitude is approximately +5.1 or better and shows a great deal of detail at +6.1. The sky needs to be darker than about 20.2 magnitude per square arcsecond in order for the Milky Way to be visible. Its visibility can be greatly reduced by background light, such as light pollution or moonlight. The Milky Way has a relatively low surface brightness. The area of sky that the Milky Way obscures is called the Zone of Avoidance. Dark regions within the band, such as the Great Rift and the Coalsack, are areas where interstellar dust blocks light from distant stars. The most conspicuous of these is the Large Sagittarius Star Cloud, a portion of the central bulge of the galaxy. Brighter regions around the band appear as soft visual patches known as star clouds. The light originates from the accumulation of unresolved stars and other material located in the direction of the galactic plane. In night sky observing, although all the individual naked-eye stars in the entire sky are part of the Milky Way Galaxy, the term 'Milky Way' is limited to this band of light. The Milky Way is visible from Earth as a hazy band of white light, some 30Р’В° wide, arching the night sky. Р”Р„ time-lapse video capturing the Milky Way arching over ALMA The oldest stars in the Milky Way are nearly as old as the Universe itself and thus probably formed shortly after the Dark Ages of the Big Bang. The Milky Way as a whole is moving at a velocity of approximately 600Р’В km per second with respect to extragalactic frames of reference. The rotational period is about 240 million years at the radius of the Sun. This conjectural mass has been termed ' dark matter'. The constant rotational speed appears to contradict the laws of Keplerian dynamics and suggests that much (about 90%) of the mass of the Milky Way is invisible to telescopes, neither emitting nor absorbing electromagnetic radiation. Stars and gases at a wide range of distances from the Galactic Center orbit at approximately 220 kilometers per second. The galactic center is an intense radio source known as Sagittarius A*, a supermassive black hole of 4.100 (Р’В± 0.034) million solar masses. The stars in the innermost 10,000 light-years form a bulge and one or more bars that radiate from the bulge. The Solar System is located at a radius of about 27,000 light-years from the Galactic Center, on the inner edge of the Orion Arm, one of the spiral-shaped concentrations of gas and dust. It is estimated to contain 100РІР‚вЂњ400 billion stars and at least that number of planets. 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.

Recent simulations suggest that a dark matter area, also containing some visible stars, may extend up to a diameter of almost 2 million light-years. The Milky Way is a barred spiral galaxy with an estimated visible diameter of 100,000РІР‚вЂњ200,000 light-years. Following the 1920 Great Debate between the astronomers Harlow Shapley and Heber Curtis, observations by Edwin Hubble showed that the Milky Way is just one of many galaxies. Until the early 1920s, most astronomers thought that the Milky Way contained all the stars in the Universe. Galileo Galilei first resolved the band of light into individual stars with his telescope in 1610. The term Milky Way is a translation of the Latin via lactea, from the Greek РћС–РћВ±РћВ»РћВ±РћС”РџвЂћРћв„–РћС”РџРЉРџвЂљ РћС”РџРЊРћС”РћВ»РћС—РџвЂљ ( galaktikos kР“Р…klos), meaning 'milky circle.' From Earth, the Milky Way appears as a band because its disk-shaped structure is viewed from within. The Milky Way is the galaxy that includes 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. For other uses, see Milky Way (disambiguation).Р”Вark matter halo: 1.9Р’В Р’В±Р’В 0.4 Mly (580Р’В Р’В±Р’В 120 kpc)

One way another one direction mp3 download