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An ice age is a period of long term reduction in the surface temperature on a planet, leading to the expansion of ice sheets, polar caps, and mountain glaciers. (TOS episode & Star Trek 4 novelization: All Our Yesterdays; TOS - The Yesterday Saga novels: Yesterday's Son, Time For Yesterday)
A powerful alien race——possibly the Borg—caused an ice age on the homeworld of the Cetacean Probe's creators by reducing the energy output of the local star when they were unable to conquer the planet. (TOS novel: Probe)