Zero gravity

Zero gravity (also called zero-g or null gravity) is the natural feeling of weightlessness experienced by space travellers or dwellers whose starship or living space lacks artificial gravity.

In 2020, the NASA astronauts aboard the USS Lewis & Clark experienced zero gravity as they travelled from Earth to Mars. 

By 2150, Earth starships possessed artificial gravity technology, but ships maintained small areas of zero gravity. Travis Mayweather referred to these areas as "sweet spots."