While various forms of anti-gravity drives are in use to some degree by most species, it is not nearly as universal a technology as FTL drives. Indeed, many species have achieved faster-than-light travel methods prior to inventing the sorts of anti-gravity or repulsor systems that allow easy lift to space, as well as providing more mundane life capacity in the form of aircars or similar. Some of these species, such as Humanity, have not fully integrated the technology even decades or centuries after entering the greater galactic community. In most cases, this reflects a infrastructure too massive for rapid or complete conversion.

Regardless of this fact, the various versions of technologies that allow some variety of gravity inversion or manipulation are still a common sight on most worlds. The technology is generally considered critical for any starship designed with atmospheric reentry capacity, and most industrialized worlds recognize automated aircars and airtrams as the ideal way to remove traffic congestion.

As for the different varieties, there are many minor variants, and several non-gravity centric drives that achieve similar effects. The most common two methods of actual gravity manipulation are null fields, which simply eliminate gravity altogether in a specified area, and gravity invertors that reverse the pull of gravity in a localized area. The two most common non-gravity manipulation engines that are generally mislabeled into this category are magnetic drives that push or pull against a planet's magnetic field, and repulsor drives that manipulate air or other environmental factors to create artificial lift.

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