Jim Lovell flew on four missions to space, saw the moon twice and almost died on Apollo 13.
With supersonic wind tunnels, giant vacuum chambers, engine test stands and a deep shaft for dropping test packages, NASA's Glenn Research Center puts air and space hardware to the test.
The James Webb Space Telescope, WFIRST, Hubble, and hundreds of other missions sprang from or have close connections to NASA's Goddard Space Flight Center.
Armstrong was the first human to step foot on the moon. He was also an accomplished engineer, test pilot and astronaut.
Venus is the brightest planet in our solar system, has a hellish atmosphere, and is covered in volcanoes. Learn more about planet Venus here.
Few know the globe's nooks and crannies more intimately than Kathryn Sullivan — explorer and student of the sky and the sea.