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The universe has a lithium problem

Over the past decades, scientists have wrestled with a problem involving the Big Bang Theory. The Big Bang Theory suggests that there should be three times as much lithium as we can observe. Why is there such a discrepancy ...

dateFeb 20, 2017 in Astronomy
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Black holes hide in our cosmic backyard

Monster black holes sometimes lurk behind gas and dust, hiding from the gaze of most telescopes. But they give themselves away when material they feed on emits high-energy X-rays that NASA's NuSTAR (Nuclear Spectroscopic ...

dateJan 08, 2017 in Astronomy
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What are active galactic nuclei?

In the 1970s, astronomers became aware of a compact radio source at the center of the Milky Way Galaxy – which they named Sagittarius A. After many decades of observation and mounting evidence, it was theorized that the ...

dateNov 09, 2016 in Astronomy
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