Breaking space news, the latest updates on rocket launches, skywatching events and more! You are now subscribed Your newsletter sign-up was successful Want to add more newsletters? Our catalog of spacetime ripples "heard" by gravitational wave detectors here on Earth has doubled, scientists say, with newly discovered sources ranging from wobbly black hole mergers to the heaviest black hole collision detected to date. Back in 1915, Albert Einstein predicted that when the most dense and extreme objects in the universe collide, these events would set the very fabric of space and time (united as a 4-dimensional entity called spacetime) ringing. Then, 100 years later, on Sept. 14, 2015, the Laser Interferometer Gravitational-Wave Observatory (LIGO) made the first detection of these spacetime ripples — they originated from colliding black holes over 1.3 billion light-years away.…