Breaking up the space launch monopoly
Budget and scheduling constraints could put astronauts at risk
More than 200,000 aspiring space explorers volunteered for a one-way trip to Mars. Are they insane?
Yesterday's Antares failure was not exactly unprecedented.
A new vehicle design could enable same-day shipping from the ISS to Earth, making science experiments in microgravity cheaper and easier.
If Sierra Nevada can't build its vehicle, no one else can.
PBS explains the physics of space skirmishes
Will NASA be required to fund the Dream Chaser?
The record-breaking rodents will travel to the International Space Station this weekend.
And it can be yours -- for a small fee