12/28/2007: For Astronomers; The Solar System exploration in 2007:

Surprises abounded in the solar system in 2007. A meteorite crashed to
Earth in Peru and left some unsolved mysteries, a massive dust storm
erupted on Mars and threatened NASA's robotic rovers, and an obscure
comet suddenly brightened by a factor of a million and became visible
to the naked eye. t was an exciting year for comets and asteroids.
Scientists discovered a new family of asteroids to which the asteroid
that killed off the dinosaurs appears to belong. The Baptistina
asteroids are fragments of a huge 170-kilometre-wide asteroid that
shattered into pieces in a collision 160 million years ago, with one
of the fragments later slamming into Earth and wiping out T. rex.

Speculation about the cause of a a crater that appeared in the
countryside of Peru on 15 September ended when an expedition of
scientists found fragments of a stony meteorite at the site. But
experts were still puzzled over some aspects of the crash, including
how the meteorite had remained in one piece without breaking apart in
the atmosphere.