For more than two decades, astronomers have been systematically searching for mysterious sources of high-energy gamma rays in their sources. One, however, remained stubborn – the most unknown source gamma rays in the galaxy. It appears to be 2,740 light-years away from the binary system, but only one star could …
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How do you study something invisible? This is a challenge facing astronomers studying the subject of darkness. Although dark matter contains 85 percent of all things in the universe, it does not interact with light. It can only be seen by the effect of gravity on light and other things. …
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About 15,000 light-years away, an active black hole periodically appears to illuminate another unremarkable cloud of gas with gamma rays. But there is a catch. The gas cloud is about 100 light-years from the black hole – and just how the cloud pulsates with it in time is a mystery. …
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