Of course! Presumably you could use heated gases in the gas giants (like hot air balloons). I found this rather old JPL page which suggests it could be possible

Of course! Presumably you could use heated gases in the gas giants (like hot air balloons). I found this rather old JPL page which suggests it could be possible: https://www2.jpl.nasa.gov/adv_tech/balloons/outer_jupisat.htm https://www2.jpl.nasa.gov/adv_tech/balloons/outer_jupisat.ht...