Scientists announced yesterday the long-awaited discovery of gravitational waves. The waves were detected on September 14, 2015 by the Advanced Laser Interferometer Gravitational-Wave Observatory, or LIGO. They were produced by the collision of two black holes, which sent ripples through space-time about 1.3 billion years ago.
There are a number of ways scientists believe the universe will ultimately end. The Big Rip, in which the universe stretches itself apart. The Big Crunch, kind of the opposite of the Big Bang, where the expansion of the universe reverses and all matter returns to a small chunk of space. And then there’s collapse.
There’s an echo throughout the cosmos, a lingering remnant from the time our universe was born, called the Cosmic Microwave Background, or CMB.