Second gravitational wave detected from ancient black hole collision
by Ian Sample Science editor from on (#1H9Z2)
Following February's historic announcement, LIGO has again spotted ripples in the fabric of spacetime, from the collision of a second set of black holes
Physicists have detected ripples in the fabric of spacetime that were set in motion by the collision of two black holes far across the universe more than a billion years ago.
The event marks only the second time that scientists have spotted gravitational waves, the tenuous stretching and squeezing of spacetime predicted by Einstein more a century ago.