Apocalypse
From a Greek word meaning 'uncovering,' the term originally referred to revelatory writing about the end of the world, such as the Book of Revelation in Christianity. It now also denotes the catastrophe that ends civilization.
The Kessler syndrome is a scenario where space debris hits a satellite, creating fragments that destroy more satellites in a chain reaction until orbit is choked with junk. Losing GPS and communications could set civilization back to 1970.
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