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/ / / 2 black holes collided billions of years ago. The spectacle is just beginning to reach Earth.

2 black holes collided billions of years ago. The spectacle is just beginning to reach Earth.

Astronomers say there are imperceptible gravitational waves generated before the collision that are hitting us right now.

     


from USATODAY - News Top Stories https://ift.tt/mAtx0MU
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