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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“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)
“Full of her long white arms and milky skin
He had a thousand times remembered sin.”
—John Crowe Ransom (1888–1974)
“I thought of all that worked dark pits
Of war, and died
Digging the rock where Death reputes
Peace lies indeed.”
—Wilfred Owen (1893–1918)
“He felt with the force of a revelation that to throw up the clods of earth manfully is as beneficent as to revolutionise the world. It was not the matter of the work, but the mind that went into it, that counted—and the man who was not content to do small things well would leave great things undone.”
—Ellen Glasgow (1874–1945)
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—Henry David Thoreau (1817–1862)