This method's only current existence is a proof considered by NASA studies.

NASA studies with chickens and plants have proven that this is an effective physiological substitute for gravity.

NASA studies still consider chemical and solar-powered propulsion as the first option.

NASA studies showed that a small but functional carrier would be most efficient for launches.

A comparable turboprop costs $9 million, and $180 an hour for maintenance, according to a NASA study.

Investigators said, though, that the NASA study was not sufficiently rigorous.

However, NASA studies have shown that the lands are still usable and only require a particular type of construction.

A NASA study reports that changes in solar activity cannot be responsible for the current period of global warming.

The ozone problem is really getting worse, according to the new NASA study.

Even under the worst circumstances, Hubble would not fall until 2013, according to a NASA study.