The nature of gas composing this atmosphere was unknown but thought to be a dense, heavy gas.

The core is made of hot, dense gas in the plasmic state.

The former is a rotating circumstellar disk of dense gas and dust that continues to feed the central star.

Not necessarily, if it was cold with dense gases.

Replies: It could have been any of several dense inert gases.

Even if it had a solid surface, it would be buried under so much dense gas that we could never survive there.

Clouds of dense, cold gas billowed from the machine, then began to settle on the floor.

A less dense gas is accelerated faster and hence it rises in comparison with the surrounding cold air.

The water observed is quickly produced in this warm dense gas.

It consists of two major regions of dense gas and dust.