Historian Jeff Shesol recalls the early days of the space program, when Cold War fears ruled and no one knew if John Glenn would survive America's first orbital flight. Originally broadcast June 2021.
NASA successfully crashed a spacecraft into an asteroid in a test of planetary defense. Now it will determine whether the mission was able to alter the asteroid's course.
At 7:14 p.m. Eastern on Sept. 26, a NASA spacecraft will crash into a small asteroid. The impact will test whether the space agency could deflect asteroids, in case one ever threatens Earth.