A "space cushion" isn't a formally defined scientific or engineering term. It's a more colloquial phrase that can refer to a few different concepts depending on the context:
In space travel: It could refer to the safe distance maintained between spacecraft, satellites, or other objects in orbit to avoid collisions. This distance accounts for navigational errors, unexpected orbital changes, and the size of the objects involved. The required "cushion" varies greatly depending on factors like the speed and maneuverability of the objects.
In astrophysics/cosmology: It might describe the vast empty spaces between galaxies, galaxy clusters, or even larger cosmic structures. These voids are not truly empty, containing a few stray particles, but their density is far lower than the areas where galaxies cluster.
Figuratively: Outside of a scientific context, "space cushion" can be used metaphorically to represent a buffer or margin of safety or leeway in any situation. For example, someone might say they built a "space cushion" into their schedule to account for unexpected delays.
Therefore, the meaning of "space cushion" heavily depends on its usage. To understand its intended meaning, you need to consider the surrounding context.
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