In the vacuum of space, the amount of debris-spent rocket stages, splintered satellites, micrometeoroids- numbers in the millions, all zooming about, often at 17,000 mph speeds. They're also constantly hitting each other in a tsuris of exponential littering. Most of these pieces are tiny, and many are not anywhere near the altitude of the ISS. But the area isn't completely clean.
The International Space Station (ISS) returned to full strength with Saturday's arrival of four new astronauts to replace colleagues who bailed early because of health concerns. SpaceX delivered the US, French and Russian astronauts a day after launching them from Cape Canaveral. Last month's medical evacuation was Nasa's first in 65 years of human spaceflight. One of four astronauts launched by SpaceX last summer suffered what officials described as a serious health issue, prompting their hasty return.
The return flight, once undocking had taken place, lasted just under 11 hours, as planned, making contact with the Pacific at 3:42 a.m. ET. At 4:20 a.m., the Dragon capsule door opened and the astronauts took in their first breath of fresh air in 167 days. The deorbiting maneuver began at 2:51 a.m., which meant 50 minutes of tension as the capsule reentered Earth's atmosphere.