Frequently Asked Questions

Frequently Asked Questions
What is GEER?
Glenn Extreme Environments Rig (GEER) is a unique and world class ground-based test rig that can accurately most simulate atmospheric conditions for any planet or moon in the solar system and beyond.

This capability enables science investigations and pre-flight development and validation of spacecraft systems and instrumentation in extreme environments.

GEER is a 28 cubic ft (800 L) chamber and will be able to simulate the extreme temperatures up to 500° C (932° F) and pressure (from near vacuum to over 90 times the Earth’s surface pressure).

GEER has gas mixing capabilities to reproduce unique planetary environments, such as the very caustic sulfuric acid found in Venus’ atmosphere, or hydrocarbons like methane found in the atmosphere of Satern’s moon Titan.

How long can GEER run?
GEER is designed to handle extreme temperatures and pressures for long durations. The length of time needed to complete a test will vary depending on customers requirements. Recently, we ran a test lasting 24 days, and could have extended if needed.
How can my test article be supported?
Each test is different and will require various level of support. We meet with all of our customers to understand their goals and mission, and then we design custom sample holder to meet their test requirements.
Can GEER be customized to meet any test conditions?
Yes, GEER can provide access to specialized extreme environments including simulating the atmospheres of Venus, Jupiter, Saturn, and numerous exoplanets.

GEER can be configured for almost any combination of gasses, temperature and pressure within the vessel structural limits.

GEER capabilities are unique in the world.
Can you use hydrogen in GEER?
Yes, the GEER facility is equip to handle the generation, installation, storage, piping, use, and handling of hydrogen in compressed gas (GH2) form. If you are interested in using hydrogen, please contact us for additional information.
Who uses GEER?
Science, technology and planetary mission communities have a growing interest in components and systems that are capable of working in extreme (high) temperature and pressure conditions.

Terrestrial applications range from scientific research, aerospace, defense automotive systems, energy storage and power distribution, deep mining and others.
Why Venus?
It’s hard to think of a more hostile environment than the surface of Venus. Temperatures reach 460 C (92 bar), the air pressure is enough to crush you, the clouds are made of sulfuric acid, which deposit rain that, because of the extreme heat, evaporates back into a never ending toxic cloud, and the atmosphere is so thick, it feels like you are moving in gelatin. NASA Glenn’s Extreme Environments Rig (GEER) is designed to put Venus bound spacecraft through tests that include 1,000 degree Fahrenheit temperatures and pressure up to 100 times that on earth.  The rig simulates altitude conditions above Venus from the upper atmosphere to the surface and includes all the most corrosive chemicals such as hydrogen fluoride and hydrogen chloride, which can destroy materials used on landers as they approach the planet.