In Photos: The Advanced JPSS-1 Weather Satellite's Earth Mission

The Joint Polar Satellite System-1 (JPSS-1), the first of an advanced new fleet of weather satellites, launched into space on Nov. 18, 2017 to begin its vital mission. See photos from the launch and preparations here in our mission gallery.

Stephen Hawking Biography

Cosmologist Stephen Hawking is regarded as a brilliant theoretical physicist. His work on black holes and the big bang are topics of popular books.