That's still surprising to many people.

226

If we decide to deflect an asteroid we will need to know just where the center is, and we need to know something about its mechanical (compositional) strength.

216

Rubble pile asteroids are something we always figured would be out there, and suddenly, 'voila,' there was one in front of us.

133

The surface is strewn with very angular, large rocks - much more so than was expected. They've picked the most benign looking spot, but it has not turned out to be very benign.

108

The object has not been co-operative at all. It is an incredibly nasty place to land.

100