“Extinction by Ice” –Massive Comets From Oort Belt More Common Threat to Earth Than Previously Thought0

• From Around the Web, Space
• July 29, 2017

“Comets travel much faster than asteroids, and some of them are very big,” said Amy Mainzer, co-author based at NASA’s Jet Propulsion Laboratory, Pasadena, California, and principal investigator of the NEOWISE mission. “Studies like this will help us define what kind of hazard long-period comets may pose.”