NGC 6240 is an ultra-rare example of a galaxy harboring three supermassive black holes (labeled N, S1, and S2 in the inset) near its core. Astronomers believe their presence, crammed into a region ...
What are the key scientific challenges for astronomy and astrophysics in the next decade? Pathways to Discovery in Astronomy and Astrophysics for the 2020s identifies the most compelling science goals ...
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