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.

A powerful alien race - possibly the Borg - caused an ice age on the home world of the Cetacean Probe's creators when they were unable to conquer the planet by reducing the energy output of the local star. (TOS novel: Probe)

See AlsoEdit

• Ice age article at Wikipedia, the free encyclopedia.