: To "come back down to earth" is an idiom for dealing with reality after a period of excitement or dreaming.
: Programs like community composting are described as a natural return to the earth , cycling nutrients back into the soil.
For real-world explorers, returning to Earth is a grueling physical and sensory experience.
: After months in the sterile, quiet vacuum of space, astronauts often find Earth to be heavy, loud, and strangely still.