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:
“The Milky Way perhaps
Was woman’s way of life.”
—Robert Frost (1874–1963)
“Go, smiling souls, your new-built cages break,
In heaven you’ll learn to sing, ere here to speak,
Nor let the milky fonts that bathe your thirst
Be your delay;
The place that calls you hence is, at the worst,
Milk all the way.”
—Richard Crashaw (1613?–1649)
“Beyond all this, the wish to be alone:
However the sky grows dark with invitation-cards....”
—Philip Larkin (1922–1986)
“No method nor discipline can supersede the necessity of being forever on the alert. What is a course of history or philosophy, or poetry, no matter how well selected, or the best society, or the most admirable routine of life, compared with the discipline of looking always at what is to be seen? Will you be a reader, a student merely, or a seer? Read your fate, see what is before you, and walk on into futurity.”
—Henry David Thoreau (1817–1862)
“There is a touch of divinity even in brutes, and a special halo about a horse, that should forever exempt him from indignities.”
—Herman Melville (1819–1891)