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The Sun, and thus the Solar System, is located in the Milky Way's galactic habitable zone. [ 106 ] [ 107 ] There are about 208 stars brighter than absolute magnitude 8.5 within a sphere with a radius of 15 parsecs (49 ly) from the Sun, giving a density of one star per 69 cubic parsecs, or one star per 2,360 cubic light-years (from List of ...
The Solar System's location in the Milky Way is a factor in the evolutionary history of life on Earth. Spiral arms are home to a far larger concentration of supernovae , gravitational instabilities, and radiation that could disrupt the Solar System, but since Earth stays in the Local Spur and therefore does not pass frequently through spiral ...
The Laniakea Supercluster (/ ˌ l ɑː n i. ə ˈ k eɪ. ə /; Hawaiian for "open skies" or "immense heaven") [2] or the Local Supercluster (LSC or LS) is the galaxy supercluster that is home to the Milky Way and approximately 100,000 other nearby galaxies.
center – the study of the central region of the Milky Way; disk – the study of the Milky Way disk (the plane upon which most galactic objects are aligned) evolution – the evolution of the Milky Way; formation – the formation of the Milky Way; fundamental parameters – the fundamental parameters of the Milky Way (mass, size etc.)
The spiral arm of the Milky Way Galaxy through which the Sun is currently travelling. Orbit of the Solar System: 17,200 pc 5.31×10 17: 17.72: The average diameter of the orbit of the Solar System relative to the Galactic Center. The Sun's orbital radius is roughly 8,600 parsecs, or slightly over halfway to the galactic edge.
As with other voids, it is not completely empty; it contains the Milky Way, the Local Group, and the larger part of the Laniakea Supercluster. The Milky Way is within a few hundred million light-years of the void's center. [5] It is debated whether the existence of the KBC void is consistent with the ΛCDM model.
This yields a mass-to-light ratio of about 300 times that of the solar ratio (M ☉ /L ☉ = 1), a figure that is consistent with results obtained for other superclusters. [ 13 ] [ 14 ] By comparison, the mass-to-light ratio for the Milky Way is 63.8 assuming a solar absolute magnitude of 4.83, [ 15 ] a Milky Way absolute magnitude of −20.9 ...
The centre of the Milky Way is about 26 000 light-years away. [35] [36] 1 × 10 5 ly: The Milky Way is about 100 000 light-years across. 1.65 × 10 5 ly: R136a1, in the Large Magellanic Cloud, the most luminous star known at 8.7 million times the luminosity of the Sun, has an apparent magnitude 12.77, just brighter than 3C 273. 10 6: 2.5 × 10 6 ly
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