After 17 years, we look back at the 2008 K2 disaster, one of the deadliest tragedies in modern mountaineering, which saw 11 ...

The bright K2 comet — previously the farthest active comet ever spotted — approaches the Earth on July 13 and 14. Here's what it is and how to see it.

Comet K2, the most pristine comet ever observed, makes a visit to Earth this week. Here's what scientists have learned since first spotting the surprising object.

When it was discovered in 2017 C/2017 K2 Panstarrs was 16 times the Earth-Sun distance. It’s a big comet, with the Hubble Space Telescope reckoning it to have a nucleus of about 11 miles/18 ...