Hypervelocity shockwaves, fiery atmospheric re-entry, global firestorms, and an apocalyptic impact winter that blots out the sun for years. Welcome to What Happens if a Comet Hits Earth? (S2, E1) | Mega Disasters | Full Episode. In this classic season premiere of the hit documentary series Mega Disasters, leading astrophysicists, planetary scientists, and disaster response experts simulate the terrifying, step-by-step destruction that would unfold if a massive long-period comet crossed Earth’s orbital path.
