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There are concerns about how he could influence NASA's climate change research.
Getting humans to Mars will take both government and private sector.
Julian Guthrie's new book, "How to Make a Spaceship" details the founding of the XPRIZE.
We look at how the number 47 boldly goes into the TV show's universe.
We're celebrating the show's anniversary with a multipart series.
Moon Express has been working toward lunar exploration since the '90s.
They said it couldn't be done: Internet in space. The dream of a totally connected world is still out of reach. Companies like OneWeb and SpaceX think a global swarm of satellites is the answer. The idea failed before — does it stand a chance today?
Here are the numbers we're reading and watching for Wednesday.
Russia gives our astronauts rides in return for other space services … and cash.
Space debris poses major risks for the future of space exploration.
