Lockheed Martin said on Wednesday that it has received a $270 million U.S. Air Force contract to integrate the Infrared Defensive System (IRDS) on the company’s fifth-generation F-22 Raptor fighter.

Angry Astronaut and Nextbigfuture commenter are making the case that SpaceX and Elon Musk must switch to nuclear thermal rockets to colonize Mars. I will ...