37K views · 410 reactions | A giant meteor, freezing over, or over-heating.... However this planet goes, we're going to need a Plan B if we want to survive. Watch 'How the Universe Works' Tuesdays at 10pm ET on Science Channel or anytime on SCI GO: https://bit.ly/2VugeCC | Science Channel | Facebook

27K views · 313 reactions | We've visited some pretty cool places on Secrets of the Underground, but this one is Rob's favorite. | Science Channel | Facebook

230K views · 5.5K reactions | More mysterious sightings from satellites pointed at Earth are examined in WHAT ON EARTH tomorrow at 9p. Here's a sneak peek of one sighting. Let's have your guesses! >> | Science Channel | Facebook

2.5K views · 53 reactions | The Pentagon declassified three U.S. Navy videos showing "unexplained aerial phenomena." But some believe they actually show Unidentified Flying Objects or UFOs. | Bloomberg Originals | Facebook

Watch Aerial Phenomena on Gaia to learn more. #UFO #ufosighting #uap #ufology | Unexplained on Gaia