Part of the vision calls for flying jets in the same formation as a flock of birds, which would reduce energy use and carbon emissions.

ENGADGET: Inhabitat's Week in Green: GPS shoes, shape-shifting bicycle and a wheelchair helicopter

Intelligent planes that are propelled into the air, flock in formation and fly 'express skyways' could cut time, delays, stress and emissions, according to Airbus experts.

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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