Gravitational Waves (General relativity prediction)
In June 1916, Albert Einstein predicted the existence of gravitational waves based on his general theory of relativity and right after 100 years, in February 2016, scientist at LIGO announced that they have detected gravitational waves caused by collision of supermassive black holes for the first time.
When two massive bodies collide in space, they disturb fabric of space-time producing ripples called gravitational waves. These type of waves produced by small objects are hard to be detected here on Earth. But on February 11, 2016, scientists from LIGO (Laser Interferometer Gravitational-wave Observatory) detected gravitational waves produced by collision of two massive black holes, a billion light years away from Earth. Each black hole was believed to be as massive as 30 suns.
