balloon launch
- heliumLightest noble gas
- hot airMeaningless boastful talk
- skyVisible overhead expanse
- ascendMove upward
- releaseTo let go
float · basket · gondola · weather · altitude · inflate · ribbon · string · tether · countdown · liftoff · soar · drift · clouds · celebration · scientific · atmosphere · payload
- launcheslaunch, launched, rocket launch, blast off, satellite launch