Space travel should by rights make for rocket-fuelled television, but documentaries on the subject too often veer into soul-numbing technobabble. That sad fate is happily avoided by the absorbing Once ...

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.

Follow the space program since the moon landing in the four-part documentary "Once Upon a Time in Space". Here’s how to watch it anywhere on the planet. After the last astronauts landed on the moon ...