Astronauts Throw Trash Into Space

MattSparkes writes "The International Space Station is home to an increasing amount of unwanted goods, and NASA has just approved a policy where these could be thrown out of the door into space. 'Tools and other gear have accidentally floated away during spacewalks. But NASA has shied away from intentionally jettisoning gear off the ISS in the past because of the threat of space junk hitting the station or other spacecraft.' The loosening of the rules on this comes just as Russian cosmonaut Mikhail Tyurin is about to take a space walk where he will hit a golf ball from the ISS in a promotional stunt for a golf company."

Comments

Re:Randomly dump their trash would be stupid

[Mindwarp]

Actually, no. If an astronaut were to throw a bag of trash 'downwards' towards the Earth then its orbital velocity relative to the space station would increase (since it is moving into a lower orbit) so it would start to overtake the space station below it. As the orbital velocity increases it would start to again climb to a higher orbit, passing above the space station in front of it. As it gained a higher orbit than the space station its orbital velocity relative to the ISS would drop, causing the trash to drop to a lower orbit. In summary, if you throw anything out of the ISS down towards the Earth it will in fact pull a complete loop and end up impacting the top of the ISS.

There is only one safe direction to throw anything out of an orbiting spacecraft - backwards, in the opposite direction of your orbit. By doing this you reduce the orbital velocity of the object relative to your spacecraft thereby guaranteeing that the object will enter a lower orbit from which it is guaranteed not to climb. At this point atmospheric drag will continue to degrade the objects orbit until it eventually burns up.