Don Pettit has never looked up to see a total eclipse. Twice though, he's looked down. As an International Space Station crew member, Pettit is one of the few astronauts to not only view a total solar eclipse from space but see the moon's shadow on Earth.
As a solar eclipse researcher, Alphonse Sterling knows the challenges of his work all too well: Even just one cloud can ruin crucial solar readings, and his next opportunity to witness the fleeting event may be years — and thousands of miles — away.
Whether you're looking for a new pair of eclipse glasses or you've already purchased some form of eye protection, here's what you need to know to avoid burning your eyes during the solar eclipse.
NASA astronaut Peggy Whitson floats in front of the Cupola window at the International Space Station. The cupola is the largest window ever launched into space and provides a clear view of Earth and incoming cargo shipments.