Physicists detected gravitational waves for the second time ever

It was one of the biggest moments in recent memory when an international team of physicists announced that they’d made the first direct observations of gravitational waves since Einstein first proposed them a century ago.

Now, just four months later, an Australian team has announced the second such achievement - they’ve directly detected gravitational waves caused by the collision of two black holes that are up to 14 times the size of our Sun.