Target: Earth?

Its been 100 years since a meteorite exploded over Tunguska in Siberia, devastating vast tracts of (thankfully) sparsely populated forest and tundra.

But what would happen if the same event occurred today? Just last week astronomers watched a small asteroid – called TU24 – pass through space just outside the Moon’s orbit.

And in 2029 a 400 metre long chunk of rock called Apophis will pass between the Earth and the Moon – to return in 2036 with a fairly high likelihood of impacting our planet in an explosion 4 to 8 times more powerful than the 1883 eruption of Krakatoa.

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