Earth (1980)

A central premise of each of the incarnations of Battlestar Galactica has been the quest of the Colonial survivors for the planet Earth.

The arrival of the Colonials at Earth, however, has only been depicted in one series, as of 2007.

In Galactica 1980, the Earth was discovered, but, much to the dismay of Adama and the survivors, the humans on Earth were underdeveloped and would not be able to defend themselves from the Cylons. The short-lived series primarily depicted the central character's adventures on Earth's surface, including its past through a means of time-travel.

Galactica 1980 Earth vs. 'Real' Earth

There are several places where the Earth depicted in Galactica 1980 was dissimilar to the Earth as we know it.

UBC News - There was no such news organization in Los Angeles at the time denoted.

Project Blue Book - Project Blue Book, a program of the United States Air Force to investigate UFOs, had long concluded by 1980. In the Galactica 1980 universe, a very similar program is very much still active.

Notes

There were hints in the Original Series that the Earth may be technologically advanced. However, perhaps due to budgetary constraints in the sequel series, Earth was ulimately revealed to be the contemporary one.