New data from the NASA Wise telescope suggests that the fragments from the Baptistina asteroid that supposedly collided with another asteroid are too young to have killed the dinosaurs. The Baptistina family of asteroids formed only around 80 million years ago, leaving only 15 million years for one of the fragments to travel from the asteroid belt to Earth, making the timing unlikely according to the new evidence.

2.  Data from space may disprove the
common belief that dinosaurs were
killed by an asteroid
 The current theory is that a large
asteroid called Baptistina collided with
another rock, throwing out huge
fragments into the Solar System.

3.  new data from the Nasa-run Wise
telescope suggest that the Baptistina
fragments are just far too young.
 The candidate asteroid, Baptistina, is
thought to have collided with another
asteroid in the "main belt" between Mars
and Jupiter, around 160 million years
ago.

4.  Critically, the Baptistina family of
asteroids - those that were formed when
the larger asteroid destructively entered
the main belt - were only formed around
80 million years ago.
 This gives the dinosaur-killing rock only
15 million years to move into a suitable
place to be flung out of the main belt
and to travel to Earth in time for the
impact 65 million years ago

5.  http://www.bbc.co.uk/news/science-
environment-15006647