Low Earth orbit, the focus of volume one of NASA’s Space Sustainability Strategy, is the most concentrated area for orbital debris. This computer-generated image showcases objects that are currently being tracked. (Image: NASA ODPO)

The issue of space sustainability has been gaining more attention with the growing population of objects in low Earth orbit — both satellites and debris. Space debris includes defunct satellites and rocket stages as well as fragments created by accidental collisions. This debris needs to be tracked to avoid collisions. Scientific models estimate that a collision with space debris can most likely disable a spacecraft and penetrate the ISS shields.

Test your knowledge about space sustainability in this quiz.