But the science team on Curiosity needed a target to try out the first close-contact work using the rover's arm-held X-ray-spectrometer, APXS. So the dark pyramid was chosen and informally given the name Jake Matijevic in honour of a recently deceased rover engineer.

BBC: Cosmic coincidence on the road to Glenelg

The different instruments were needed to track down the target galaxies, measure star formation and identify mergers, and, crucially, with Chandra, see the X-ray emissions that come from heated material as it is sucked into a black hole.

BBC: NEWS | Science/Nature | Deepest X-rays tell merger story