Jared Isaacman, Trump’s Pick to Lead NASA, Calls Mars a Priority in Confirmation Hearing

Jared Isaacman, a billionaire entrepreneur who has twice launched to orbit in a SpaceX vehicle, will testify before the Senate on Wednesday.

After Crash, F.A.A. Change Requires All Aircraft at Reagan to Broadcast Positions

The agency’s acting director told senators of the new policy after it was revealed that tracking technology had been disabled before a deadly midair collision in January.

After the Signal Leak, How Well Do You Know Your Own Group Chats?

A journalist’s inclusion in a national security discussion served as a reminder that you might not know every number in the chat — and that could be a big problem.