NASA @NASA
⚫ Are black holes… 🌐 Portals to other universes? 🔄 Time warping? 😵 Dangerous? Our black hole expert is answering your questions in a @Tumblr Answer Time today at 3pm ET. Tune in & learn more about these mysterious phenomena: https://t.co/EsW83kLfMS https://t.co/uIF5lULhK1 — PolitiTweet.org