Milky Way Dark Matter Halo
The visible disk of the Milky Way Galaxy is embedded in a much larger, roughly spherical halo of dark matter. The dark matter density drops off with distance from the galactic center. It is now believed that about 95% of the Galaxy is composed of dark matter, a type of matter that does not seem to interact with the rest of the Galaxy's matter and energy in any way except through gravity. The luminous matter makes up approximately 9 x 1010 solar masses. The dark matter halo is likely to include around 6 x 1011 to 3 x 1012 solar masses of dark matter.
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Famous quotes containing the words milky way, milky, dark, matter and/or halo:
“Nothing has shown more fully the prodigious ignorance of human ideas and their littleness, than the discovery of [Sir William] Herschell, that what used to be called the Milky Way is a portion of perhaps an infinite multitude of worlds!”
—Horace Walpole (1717–1797)
“The eye-balls were seared with a milky mucus;
The madness of a dying soul
Was written on her face—
But the multitude saw why she wore the bandage.””
—Edgar Lee Masters (1869–1950)
“do not sleep
he wants to climb out of the toilet when you sit on it
and make a home in the embarrassed hair do not sleep
he wants you to walk into him as into a dark fire.”
—Anne Sexton (1928–1974)
“It is not so much that women have a different point of view in politics as that they give a different emphasis. And this is vastly important, for politics is so largely a matter of emphasis.”
—Crystal Eastman (1881–1928)
“Most books belong to the house and street only, and in the fields their leaves feel very thin. They are bare and obvious, and have no halo nor haze about them. Nature lies far and fair behind them all. But this, as it proceeds from, so it addresses, what is deepest and most abiding in man. It belongs to the noontide of the day, the midsummer of the year, and after the snows have melted, and the waters evaporated in the spring, still its truth speaks freshly to our experience.”
—Henry David Thoreau (1817–1862)