A neutron-star crash spotted 3 years ago is still pumping out X-rays. But why?

Three years ago, two neutron stars collided in a cataclysmic crash, the first such merger ever observed directly. Naturally, scientists kept their eye on it — and now, something strange is happening. Astrophysicists observed the star collision on Aug. 17, 2017, spotting for the first time ever signs of the same event in both a […]