There are many theories about how the world might end and when, but a British scientist thinks one particular threat is looming.
One, a few hundred metres across, devastated more than 2000 square kilometres of forest near Tunguska in Siberia on June 30, 1908.
Launching in 2024, the probe will measure the movement of a smaller asteroid moon knocked out of its orbit by an earlier spacecraft.We've survived Y2K and 2012, but will we survive these theories about how the world will end? Some scientists believe such a technique won’t work and would prefer firing a nuclear bomb at space rocks bearing down on our planet.For what it’s worth, NASA doesn’t believe any of the thousands of “near-Earth objects” it keeps an eye on are currently on a collision course with our planet.
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