NASA astronaut Karen Nyberg, an Expedition 37 flight engineer aboard the International Space Station, demonstrates how astronauts run on the COLBERT treadmill in a weightless environment. Station crew members exercise for at least two hours every day to keep fit and to prevent the loss of muscle mass and bone density that occurs during long-duration spaceflight.
Meteors are often called shooting stars. But what is a shooting star? What causes meteor showers? And why are comets like dirty snowballs?
NASA building the next chapter, returning to the Moon to stay, and preparing to go beyond.
This was filmed while on its way to the Space Station a few days ago.
