Watch Expedition 55/56 flight engineer Ricky Arnold in this two-part episode as he explains spacewalk safety and training in addition to the parts of the spacesuit that protects astronauts outside the space station.

We talk to Dr. Alan Stern, the leader of NASA’s mission to Pluto – New Horizons.

In this episode we hear from astronomer Laura Danly about the search for life on other planets.

You voted and chose this intense matchup from the depths of darkness, under the water and beyond our earth’s atmosphere.

In this episode we learn about Mars’ ancient past, meet an architect hoping to build cities there and we hear from Mars itself, thanks to the planet’s video blog, of course.

If you’ve ever heard an old recording of a NASA space mission, then you’ve heard a Quindar tone.

On this week’s show, we reflect on how telescopes have shifted our perspective on how small we are in size, space, and time.

Would you spend the estimated $200,000 for a 45-minute trip into space?

Space is now big business.

In this show, Brandon Fibbs reviews the latest Star Trek movie now in theaters, and Lawrence Krauss talks about how Star Trek uses science to explore what is possible in our universe.

Scientists have been searching for aliens in our solar system and beyond, but have not yet found evidence that life exists beyond Earth.

In this show, Neil Armstrong, Buzz Aldrin, and many others share their memories of Apollo, and say what they think should be NASA’s next step in space.