A mysterious X-ray signal of 24 billion light-years away from Earth has been detected. Scientists say that the unidentified signal is in the Perseus galaxy cluster is "intensity at a very specific wavelength of X-ray light." Whereas the origin is unknown, the perspective of the astrophysicist Ezra theorises is decayed by sterile neutrinos and has been proposed as a candidate for the preparation of dark matter species. Astronomers believe that the dark matter constitutes 85% of the material in the universe, but the light that does not emit or absorb, like matter, constitutes planets, stars, and galaxies. "We know that the interpretation of dark matter is a long shot. If we are right, the rewards will be enormous," said Bulbul, a postdoctoral researcher at the Smithsonian Astrophysics Center at Harvard University, in a statement.
The fundamental reason why leather is soft is that when leather is made, oil is introduced into the interior of animal skin to form an oil film that completely covers the surface of the fibers inside the skin, that is, a layer of oil film with appropriate thickness is used to separate the surface of the fibers inside the skin. In this way, the friction between the fibers inside the leather is equivalent to the friction of the oil molecules, so the leather will be very soft. Its principle is similar to that of sponge, but the difference is that the inner surface fibers of dermis are separated by oil film, which makes the inner surface of dermis have sliding pores, but its pores are smaller than that of sponge, and the distribution of the inner surface fibers of dermis is not as regular as that of sponge.
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He went on to say, "So we have to keep testing this explanation and see if it needs us." Bulbul's team took 17 days to take a look at signals from NASA's Chandra X-ray Observatory and the European Space Agency's XMM-Newton after more than 10 years of observation.