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Milky Way Galaxy Map Nasa

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Much of the mass of the Milky Way appears to be dark matter, an unknown and invisible form of matter that interacts gravitationally with ordinary matter. A dark matter halo is conjectured to spread out relatively uniformly to a distance beyond one hundred kiloparsecs (kpc) from the Galactic Center. Mathematical models of the Milky Way suggest that the mass of dark matter is 1–1. 5×1012 M☉. [53] Recent studies indicate a range in mass, as large as 4. 5×1012 M☉[54] and as small as 8×1011 M☉. [55] The total mass of all the stars in the Milky Way is estimated to be between 4. 6×1010 M☉[56] and 6. 43×1010 M☉. In addition to the stars, there is also interstellar gas, comprising 90% hydrogen and 10% helium by mass,[57] with two thirds of the hydrogen found in the atomic form and the remaining one-third as molecular hydrogen. [58] The mass of this gas is equal to between 10%[58] and 15%[57] of the total mass of the galaxy's stars. Interstellar dust accounts for an additional 1% of the total mass of the gas. [57]

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