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NASA @NASA
Hearing about #BlackHoles this morning? Here's a refresher on what a black hole IS. 🤔 It's a place where a large amount of mass has been squeezed into a tiny space. The gravity is so strong that not even light can escape from a black hole. Learn more: https://t.co/lkbaYWv5cz https://t.co/RVuuxpaJPG — PolitiTweet.org