The future of U.S. human spaceflight won't end with the conclusion of Atlantis' mission.

As such, it is seen as crucial for restoring American prestige in human spaceflight.

The human spaceflight program is in your hands, Mr. President.

SpaceX hopes to be rated for human spaceflight by 2015.

In 2010, the White House abruptly decided to end the human spaceflight program Constellation.

American human spaceflight is at a turning point, and its future looks a bit shaky.

During Apollo, human spaceflight and technological prowess went hand-in-hand.

NASA has observed a bizarre effect of human spaceflight: blood going backwards in astronauts' veins.

Such disruptions are inconvenient and potentially costly, but in human spaceflight, the stakes are even higher.

But successfully sending an American to Mars must be the centerpiece of NASA's human spaceflight program.

For more substantial observatories or human spaceflight, the agency needs to see A+s, not Bs.

Top among them is that NASA does not have enough money to fund a human spaceflight program.

It is safe enough for human spaceflight.

Thumbs-up, in the name of human spaceflight.

That stance was at odds with NASA's long history of transparency surrounding accidents involving its human spaceflight program.

So this is a key moment really, says David Parker, ESA's director of human spaceflight and robotic exploration.