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This Hubble Space Telescope view of the core of one of the nearest globular star clusters, called NGC 6397, resembles a treasure chest of glittering jewels. The cluster is located 8,200 light-years away in the constellation Ara. Here, the stars are jam-packed together. The stellar density is about a million times greater than in our Sun's stellar neighborhood. The stars are only a few light-weeks apart, while the nearest star to our Sun is over four light-years away. The stars in NGC 6397 are in constant motion, like a swarm of angry bees. The ancient stars are so crowded together that a few of them inevitably collide with each other once in a while. Near misses are even more common. Even so, collisions only occur every few million years or so. That's thousands of collisions in the 14-billion-year lifetime of the cluster. (Photo by NASA/WireImage)

For only the second time ever, a series of Fast Radio Bursts (FRBs) have been discovered coming from a galaxy over 1 billion light years away. The extremely rare repetition was found by scientists in British Columbia. The bursts last less than half a second, but each one produces more energy than the sun does in one year.

Scientists remain stumped on what could be releasing the bursts. There are a vast array of occurrences that radio waves in space can indicate, such as star births, supermassive black holes, and dark matter.

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