We think we know everything about the place we live in: we might know our neighbors, the owner of the closest supermarket, the guy who always walks his dog in the nearest park. How about the bigger place we live in – our planet Earth, or even bigger – our Galaxy? Do you know what's going on right above our heads, in outer Space? Some of the object in Space constantly bump into each other, like meteors and planets, or comets and stars, or even two black holes. Black holes collisions are so powerful that they send gravitational waves all across cosmos. Some of the fine-tuned detectors here on Earth even allow us to hear the sound from those collisions. I wonder, what it sounds like!
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