This artist's concept illustrates a supermassive black hole with millions to billions times the mass of our sun.
Credit: NASA/JPL-Caltech
Five years ago, on June 13, 2012, Caltech's Fiona Harrison, principal investigator of NASA's NuSTAR mission, watched with her team as their black-hole-spying spacecraft was launched into space aboard a rocket strapped to the belly of an aircraft.
From Jet Propulsion Laboratory/NASA
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