Few know the globe's nooks and crannies more intimately than Kathryn Sullivan — explorer and student of the sky and the sea.
Flying at the very tip-top of Earth's atmosphere, SOFIA has almost as clear a view as space-based telescopes.
String theory started as a simplification of everything, but has become increasingly complex over the years.
Going to the moon is hard, and Israeli nonprofit SpaceIL is one of a handful of organizations that knows exactly how hard.
The CHIME radio telescope aims to explain two poorly understood cosmic phenomena, one dating back to the early universe and one taking place today.