The Milky Way For Children Galaxies And Space Astronomy

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Much of the mass of the Milky Way seems 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☉. [54] Recent studies indicate a range in mass, as large as 4. 5×1012 M☉[55] and as small as 8×1011 M☉. [56] The total mass of all the stars in the Milky Way is estimated to be between 4. 6×1010 M☉[57] and 6. 43×1010 M☉. In addition to the stars, there is also interstellar gas, comprising 90% hydrogen and 10% helium by mass,[58] with two thirds of the hydrogen found in the atomic form and the remaining one-third as molecular hydrogen. [59] The mass of the Milky Way's interstellar gas is equal to between 10%[59] and 15%[58] of the total mass of its stars. Interstellar dust accounts for an additional 1% of the total mass of the gas. [58]

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