High Quality Content by WIKIPEDIA articles! In the science fiction television series Stargate SG-1 and its sequels, several types of starships are introduced in the later seasons. In the series, they are the product of several years` worth of research into alien technologies discovered on off-world missions to other planets visited via the stargate. The stargate is an alien device discovered on Earth that allows near instantaneous travel to other planets via a controlled wormhole across a network of similar gates. The stargate was created by an extinct race called the Ancients, but are in use by aliens, some of which use both stargate and starship travel. Some of these alien races are hostile to Earth and bent on galaxy-wide domination, so Earth starships are built by the US military through billions of dollars in secret funding to respond to the threat.