X-ray “heartbeats” of two different black holes that ingest gas from their companion stars. GRS 1915 has nearly five times the mass of IGR J17091, which at three solar masses may be the smallest black hole known. Credits: NASA's Goddard Space Flight Center

NASA’s Rossi X-ray Timing Explorer Leaves Scientific ‘Treasure Trove’

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​image credit: NASA’s Wide Field Infrared Survey Telescope, illustrated here, will fly in the mid-2020s and provide astronomers with the most complete view of the cosmos to date. Credit: NASA’s Goddard Space Flight Center/CI Lab

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Merging black holes generate gravitational waves. These ripples in space-time might be used to unveil hidden dimensions. © Simulating eXtreme Spacetimes (SXS)

Hints of extra dimensions in gravitational waves?

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