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When talking about asteroidal impacts, it's worth noting that the diameter of an object is not an indication of potential impact. The density and more important is the velocity at which it impacts the Earth is.

However, an asteroid with a diameter of 70 miles would not destroy the Earth. The Earth has been hit by much larger objects (Theia) and survived - yet only just.

A 70 mile asteroid would make a large impact but it would not destroy the Earth.

A 70 mile asteroid would however, with the right velocity and angle, in all probability, wipe all life off of the Earth and cause years of non regeneration. Simple life would eventually recolonise the planet, but it would take millions of years for complex animals to evolve. So much so, that a devastation on that scale would eliminate mankind from the Universe as we know it.

The asteroid that wiped out the Dinosaurs and ended their reign was a mere 10 miles in diameter and produced 2 million times more energy that our most powerful atomic bomb.

So the 70 mile asteroid would not destroy the Earth but it would certainly destroy everything on it.

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Related Questions

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