To simulate a zero-gravity environment, volunteers lie down for three weeks on beds with their feet about five inches higher than their heads.

He describes the challenges of going to the bathroom in a zero-gravity environment in squirming detail.

The zero-gravity environment of Discovery's observation deck was always dusty, for the air-filtration plant had never been brought back to full efficiency.

Designed for use in low- or zero-gravity environments, the jets were all but worthless here.

How does water freeze in a zero-gravity environment where the difference in the density of ice and liquid water doesn't come into play?

Making sure the inflation mechanism would work in a zero-gravity environment also proved daunting.

Tyson watched as the red smoke billowed up slowly from the dead body as though the man were bleeding into a zero-gravity environment.

He realises that the Manussans must once have been a very advanced people who could use molecular engineering in a zero-gravity environment.

A low- or zero-gravity environment might be the safest for it during its convalescence.

He went through and grabbed on to the webbing that was easier support in the zero-gravity environment and looked around.