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NASA's Spitzer Space Telescope has provisionally detected the faint afterglow of the explosive merger of two neutron stars in the galaxy NGC 4993. The event, labeled GW170817, was initially detected in gravitational waves and gamma rays. Subsequent observations by dozens of telescopes have monitored its afterglow across the entire spectrum of light. The event is located about 130 million light-years from Earth. Spitzer's observation on September 29, 2017, came late in the game, just over 6 weeks after the event was first seen. But if this weak detection is verified, it will play an important …
