This year is the 25th anniversary of humans inhabiting the International Space Station. A new PBS documentary looks at how the ISS was built and the challenges of surviving in outer space.

"Operation Space Station: High-Risk Build" debuts Nov. 5, 2025 at 9 p.m. ET on PBS. "Operation Space Station: Science and Survival" drops Nov. 12, 2025, at 9 p.m. ET. Both will stream at PBS.org/NOVA, ...

Many scientists hold the belief that the paradoxes associated with time travel, which have perplexed thinkers for centuries, can indeed be resolved. This notion arises from various scientific theories ...

Whether space-time exists should neither be controversial nor even conceptually challenging, given the definitions of “space-time,” “events” and “instants.” The idea that space-time exists is no more ...