"An epic exploration of possibilities. What If is a Webby Award-winning science web series that takes you on a journey ...

On March 6, 1986, the Soviet Union's Vega 1 spacecraft flew by Halley's Comet. Vega 1 was the first of five missions to fly ...

Perhaps many of us are old enough to remember the arrival of Halley’s Comet in 1986. This famous comet makes its way to earth ...

A comet called ATLAS dazzled the southern skies for the last few weeks. Now it's heading out of view for half a million years ...