How Will The World End?
It's a question that's preoccupied scientists, movie directors, and doomsday cults alike. As it turns out, we have some pretty good guesses as to what will destroy our planet-and, in time, even the universe. Sift through some apocalyptic scenarios and try not to panic.
from PBS Space Time
Key Facts In This Video
Breaking apart Earth would take as much solar energy as the Earth receives over 40 million years. (0:30)
To destroy Earth, the largest known asteroid would have to hit the planet at 700 km/s. (2:06)
In 100 billion to a few trillion years from now, the expansion of the universe might affect smaller-scale objects, such as planets. (5:43)