What effect did an asteroid have on the earth?
One hypothesis is that a large asteroid or meteor impact on the Earth was what caused the mass extinction of the dinosaurs 65 million years ago. The likely impact point was on the Yucatan peninsula, and the results would have included an atmospheric dust layer that blocked sunlight for years. This would have reduced worldwide temperatures and killed off much of the plant life.
Unless the asteroid actually STRIKES the Earth, then they have virtually no effect at all. If the asteroid does strike the Earth, then it will cause damage like any other falling rock, although in this case the rock is falling at at least 25,000 miles per hour and may be tons or thousands of tons in size. An asteroid the size of a school bus exploded in the atmosphere over Chelyabinsk, Russia on February 15…
No known existing equipment or firm plans are in place at this time for stopping a huge potential Earth strike asteroid from making contact. Ideas being bandied about are nuclear detonations at or near the asteroid, and propulsion system attachment to the asteroid to veer it away from Earth intercept.