Space hazards

defunct artificial object or collection of such objects in space

temporary disturbance of the Earth's magnetosphere caused by a disturbance in the interplanetary medium

Solar System object whose orbit brings it into proximity with Earth

planetary low-orbit debris hazard

asteroid or comet with an orbit such that it has the potential to make close approaches to the Earth

hypothetical vacuum, less stable than true vacuum

thumb|250px|Micrometeorite, collected from the Antarctic snow, was a micrometeoroid before it entered the Earth's atmosphere A micrometeoroid is a tiny meteoroid: a small particle of rock in space, usually weighing less than a gram. A micrometeorite is such a particle that survives passage through Earth's atmosphere and reaches Earth's surface.

measure in astronomy

Wikimedia disambiguation page

space mission to retrieve tangible samples from an extraterrestrial location and return with them to Earth for analysis

Soviet artificial satellite destroyed by ASAT missile

supernova that occurs close enough to the Earth to have noticeable effects on its

solar phenomenon

thumb|The "energy flash" of a hypervelocity impact during a laboratory simulation of what happens when a piece of orbital debris hits a spacecraft in orbit thumb|The aftermath of a hypervelocity impact, with a projectile the same size as the one that impacted for scale