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Black Holes - Mysteries Of The Universe 
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A black hole is a mathematically defined region of spacetime exhibiting such a strong gravitational pull that no particle or electromagnetic radiation can escape from it.
‪#‎black_holes‬
‪#‎the_universe‬
https://www.youtube.com/watch?v=l3EXkcsoJKs

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وثائقي تيوب | WasaQy - أفلام وثائقية عربية - http://wasaqytube.blogspot.com
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