It’s hardly an exaggeration to say that dark matter is one of the biggest mysteries in the universe. Cosmologists haven’t directly observed the stuff, but based on measurements of baryonic matter—the type we can see—it is thought that about 27 percent of the universe is made up of dark matter.
Source: vice.com
The story begins four years ago when Schwadron and colleagues first sounded the alarm about cosmic rays. Analyzing data from the Cosmic Ray Telescope for the Effects of Radiation (CRaTER) instrument onboard NASA’s Lunar Reconnaissance Orbiter (LRO), they found that cosmic rays in the Earth-Moon system were peaking at levels never before seen in the Space Age. The worsening radiation environment, they pointed out, was a potential peril to astronauts, curtailing how long they could safely travel through space.
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