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" ... Clumps of matter can be so dense that not even infrared light can penetrate them. They cast the... [+] deepest shadows of all, and Spitzer captured some of them here (in silhouette) against a backdrop of massive, newly forming stars. The white clumps are where the detector has been saturated, and are likely the locations of the newest, bluest, most massive stars of all: O-class stars, which will likely all end their lives in supernova explosions in just a few million years. ... "
" ... Over time, a great cosmic web forms, with dense clumps of matter leading to galaxies forming along filamentary lines and rich galaxy clusters building up at the intersectional nexus of multiple filaments. While, on average, dark matter is expected to form an enormous, diffuse halo surrounding the normal matter, there will also be smaller “clumps” of dark matter that persist within the larger halo. The nature of dark matter determines the distribution of the various sizes, masses, and numbers of clumps within each halo. ... "
" ... The reason that normal matter forms the complex structures that we see, structures like galaxies, star clusters, individual Solar Systems and other “clumps” of matter, is because it can experience these non-gravitational interactions. Through the electromagnetic and nuclear forces, normal matter can do all of the following: ... "
" ... When we look at systems of gravitational lenses, we can not only measure the total mass of the lens, but the distribution of various mass clumps in between ourselves and the objects we're looking at. They help teach us that dark matter is not only real, but that it must have been moving quite slowly at relatively early times: a necessary condition to form the tiny clumps of mass that agree with our observations. ... "