It is a nebula.
A nebula is an interstellar cloud of dust, hydrogen gas and plasma. It is the first stage of a star's cycle.
Venus is not a gaseous planet. It is a rocky planet covered by cloud.
protogalactic cloud
Uranus is a large, gaseous planet with thin, dark rings. Neptune and Jupiter are also large, gaseous planets.
Jupiter
Technically they can be as most of their volume is gaseous. However you compress a cloud it will warm adiabatically, and with enough heating from compression the cloud will evaporate.
saturn
Large, gaseous and cold
The Large Magellanic cloud.
a very large tall cloud
Large, gaseous and cold