世界各地有許多創造天地的神話圍繞著銀河系發展出來。很特別的是，在希臘就有兩個相似的希臘神話故事在解釋銀河是怎麼來的。有些神話將銀河和星座結合在一起，認為成群牛隻的乳液將深藍色的天空染白了。在東亞，人們相信在天空中群星間的霧狀帶是銀色的河流，也就是所謂天河。
Appealing reality: From the southern latitudes, the viewing disorders on the Milky Way are better. There, the Milky Way all night time very long in Winter season months in the event the nights are lengthier and darker.
The Galaxy started forming a little bit more than thirteen billion a long time in the past. Types propose that the stars in the halo and globular clusters formed initial, when the Galaxy was spherical. The gasoline, somewhat enriched in significant factors by the initial era of stars, then collapsed from a spherical distribution to the rotating disk-shaped distribution.
one or superior and displays a substantial amount of depth at +6.1.[sixty eight] This can make the Milky Way hard to see from brightly lit urban or suburban regions, but very distinguished when viewed from rural regions if the Moon is down below the horizon.[d] Maps of synthetic night time sky brightness present that more than one-third of Earth's inhabitants are not able to begin to see the Milky Way from their residences resulting from gentle air pollution.[69]
Stars are still forming these days through the gas and mud that continue being while in the disk. Star development occurs most swiftly inside the spiral arms.
Stars during the disk orbit round the galactic Heart, forming swirling streams that show up to emanate like arms with the galactic bulge. Investigate into your mechanisms that push the creation of spiral arms remains in its infancy, but the newest studies counsel that these arms form and disperse in rather brief periods of as much as 100 million years (out with the galaxy's thirteen billion decades of evolution).
There are lots of approaches getting used in astronomy in defining the scale of the galaxy, and every of them can yield different final results with regard to one another. The mostly utilized strategy will be the D25 conventional – the isophote the place the photometric brightness of the galaxy from the B-band (445 nm wavelength of sunshine, during the blue Portion of the visible spectrum) reaches twenty five mag/arcsec2.[121] An estimate from 1997 by Goodwin and Other folks in contrast the distribution of Cepheid variable stars in seventeen other spiral galaxies to the ones from the Milky Way, and modelling the relationship for their surface brightnesses.
Beyond the most important spiral arms is the Monoceros Ring (or Outer Ring), a ring of fuel and stars torn from other galaxies billions of decades back. Even so, quite a few customers from the scientific community just lately restated their posture affirming the Monoceros composition is absolutely nothing more than an about-density made by the flared and warped thick disk of your Milky Way.[229] The construction of the Milky Way's disk is warped along an "S" curve.[230]
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The halo also holds streams of stars—the continues to be of dwarf galaxies torn apart by tidal forces given that the Milky Way absorbed them.
According to latest studies, the Milky Way plus the Andromeda Galaxy lie in what within the galaxy coloration–magnitude diagram is known as the "environmentally friendly valley", a location populated by galaxies in changeover through the "blue cloud" (galaxies actively forming new stars) on the "purple sequence" (galaxies that absence star development). Star-formation action in inexperienced valley galaxies is slowing since they operate out of star-forming gasoline in the interstellar medium.
Astronomers are not very positive the number of planets are in the Milky Way, specified We have now only located some thousand all explained to, but one particular NASA estimate implies It is really greater than one hundred billion planets. The amount of solar devices there are within the Milky Way is likewise a thriller, as we remain searching for the planets.
古代的亞美尼亞神話稱銀河系為麥稈賊之路，敘述有一位神祇在偷竊麥稈之後，企圖用一輛木製的運貨車逃離天堂，但在路途中掉落了一些麥稈。
The center location on the Milky Way is called the Galactic Center, and it incorporates a supermassive black hole of about four million solar masses identified as Sagittarius A*. To see the black hole, you’ll need a Particular radio telescope.