SpaceX has been trying, but not succeeding, to land its Falcon 9 rocket upright at sea. Then, last month it succeeded on land. Soon, another sea-going attempt!
At 26 million light-years from Earth, NGC 5195 has one of the nearest supermassive black holes to Earth that's currently undergoing such violent outbursts.
As water piles up before a ship, so material stacks up ahead of high-mass stars moving fast through space. These cosmic bows shocks revealed the runaway stars.