More than 500,000 pieces of debris, or “space junk,” are tracked as they orbit the Earth. They all travel at speeds up to 17,500 mph, fast enough for a relatively small piece of orbital debris to damage a satellite or a spacecraft.
In the 50-plus years that humans have been zipping through space more than 6,000 satellites have been launched. While some have made their way back down to Earth, more than 3,600 remain in orbit.
- It’s estimated that between 100 and 150 tons of space junk re-enters our atmosphere each year — with the vast majority of it burning up before it hits the ground.
- Scientists are looking to develop methods of removing some of the space junk that’s currently in orbit.
- Some worry that if we don’t act fast enough, the Kessler syndrome will be observed. This would occur if space debris continues to pile up, eventually reaching the point where it would be impossible to launch new objects without creating a collision.
Stuff in Space
Stuff in Space is a realtime 3D map of objects in Earth orbit, visualized using WebGL. (Shown above)
Stuff in Space on GitHub, by James Yoder.: https://github.com/jeyoder/ThingsInSpace
The US. department of Defense maintains an accurate log of all the objects in the Earth’s orbit that are larger than a softball — and if you’d like to get an idea of what all that might look like, you can — via an interactive map called Orbital Objects. http://www.alexras.info/code/orbital_objects/
The rising population of space debris increases the potential danger to all space vehicles, but especially to the International Space Station, space shuttles and other spacecraft with humans aboard.
NASA takes the threat of collisions with space debris seriously and has a long-standing set of guidelines on how to deal with each potential collision threat. These guidelines, part of a larger body of decision-making aids known as flight rules, specify when the expected proximity of a piece of debris increases the probability of a collision enough that evasive action or other precautions to ensure the safety of the crew are needed.
Space debris encompasses both natural (meteoroid) and artificial (man-made) particles. Meteoroids are in orbit about the sun, while most artificial debris is in orbit about the Earth. Hence, the latter is more commonly referred to as orbital debris.
Orbital debris is any man-made object in orbit about the Earth which no longer serves a useful function. Such debris includes nonfunctional spacecraft, abandoned launch vehicle stages, mission-related debris and fragmentation debris.
There are more than 20,000 pieces of debris larger than a softball orbiting the Earth. They travel at speeds up to 17,500 mph, fast enough for a relatively small piece of orbital debris to damage a satellite or a spacecraft. There are 500,000 pieces of debris the size of a marble or larger. There are many millions of pieces of debris that are so small they can’t be tracked.
Source: Space Debris and Human Spacecraft: http://www.nasa.gov/mission_pages/station/news/orbital_ debris.html