When NASA set out to slam a spacecraft into a comet, the goal was not spectacle but data: a controlled impact that could peel ...

NASA's Deep Impact spacecraft successfully crashed into Comet Tempel 1 early Monday. Scientists arranged the collision in an effort to learn more about the physical makeup of comets. A wealth of data ...

Mainstream science has done its best to debunk the notion, but a belief in a world-changing series of prehistoric impacts continues to gain momentum. Credit...Photo illustration by Ricardo Tomás ...

Twenty-five years ago, humanity first witnessed a collision between a comet and a planet. From July 16 to 22, 1994, enormous pieces of the comet Shoemaker-Levy 9 (SL9), discovered just a year prior, ...