For the first time in history, scientists will be able to observe how the Earth's gravity will disrupt a massive asteroid's spin:). Scientists (Daniel Scheeres and colleagues) at University of Michigan predict a near-miss when Asteroid 99942 Apophis passes Earth in 2029. An asteroid flies this close to the planet only once every 1,300 years. The chance to study it will help scientists deal with the object should it threaten collision with Earth.

Close Encounter of the rocky kind (Courtesy: Wikipedia)Only about three Earth diameters will separate Apophis and Earth when the 400-meter asteroid hurtles by Earth's gravity, which will twist the object into a complex wobbling rotation. Such an occurrence has never been witnessed but could yield important clues to the interior of the sphere:D.
Apophis is one of more than 600 known potentially hazardous asteroids and one of several that scientists hope to study more closely. In Apophis' case, additional measurements are necessary because the 2029 flyby could be followed by frequent close approaches thereafter, or even a collision:-SS. If NASA places measuring equipment on the asteroid's surface, scientists could for the first time study an asteroid's interior, similar to how geologists study earthquakes to gain understanding of the Earth's core:):).
The asteroid is relatively small, about the length of three football fields. If it hit it wouldn't create wide-scale damage to the Earth, but would cause major damage at the impact site. But readers need not worry, the chance that it might hit is 1 in 300:):).