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" ... According to the original observations of Penzias and Wilson, the galactic plane emitted some ... [+] astrophysical sources of radiation (center), but above and below, all that remained was a near-perfect, uniform background of radiation, consistent with the Big Bang and in defiance of the alternatives. ... "
" ... But are we really doing a good job if this is how we’re calculating dark matter? Not necessarily. It’s very easy to assume that the stars in our galaxy work exactly like the planets in our Solar System do: that there’s a force pointing towards the galactic center accelerating these stars, keeping them in a regular, elliptical path. We assume, in other words, that our galaxy is a galaxy in equilibrium, and that the kinetic energy of each individual star’s motion balances, in a particular way, the gravitational potential energy of the galaxy. ... "
" ... The dark matter structures which form in the Universe (left) and the visible galactic structures ... [+] that result (right) are shown from top-down in a cold, warm, and hot dark matter Universe. From the observations we have, at least 98%+ of the dark matter must be either cold or warm; hot is ruled out. ... "
" ... The galactic centre region of the Milky Way in Sagittarius and Scorpius, over the upper field of the ... [+] Texas Star Party, near Fort Davis, Texas, May 13, 2015. About 600 people gather here each spring for a star party under very dark skies near the MacDonald Observatory. Sagittarius is left of centre and Scorpius is right of centre with the planet Saturn the bright object at the top edge right of centre. The dark lanes of the Dark Horse and Pipe Nebula areas lead from the Milky Way to the stars of Scorpius, including Antares. The semi-circular Corona Australis is just clearing the hilltop at left of centre. This is a composite of 5 x 3 minute exposures with the camera tracking the sky for more detail in the Milky Way without trailing. Each tracked exposure was at ISO 1600. The ground comes from 3 x 1.5-minute exposures at ISO 3200 taken immediately after the tracked exposures but with the drive turned off on the tracker. All are with the 24mm lens at f/2.8 and filter-modified Canon 5D MkII camera. The ground and sky layers were stacked and layered in Photoshop. The tracker was the Sky-Watcher Star Adventurer. High haze added the natural glows around the stars Ü no filter was employed here. (Photo by: Alan Dyer /VW PICS/Universal Images Group via Getty Images) ... "