Apophis is thought to resemble asteroid Itokawa, pictured here,
When asteroid 99942 Apophis flies closely past Earth in 2029, the gravitational interaction between the two bodies is likely to dramatically alter the asteroid's surface.
The most immediate effect would kick in as the asteroid draws in for its closest approach to Earth. As it whizzes by, the 99942 Apophis would shake in a series of short-term seismic events. These seismic events could be detectable, and produce surface accelerations of magnitudes similar to the asteroid's gravity.
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