The dummies are fitted with more than 5,600 sensors each, which will measure exposure to space radiation.
Hibernation technology may enable mission designers to reduce spacecraft mass by around a third.
The Exploration Extravehicular Mobility Unit builds on the designs of spacesuits currently used by astronauts when they conduct spacewalks outside the International Space Station.
The Mars 2020 mission is scheduled to launch in July 2020, and it is expected to reach the red planet in February 2021.
The building was constructed as a facility to quarantine astronauts and the material they brought back from the moon during the Apollo program.
"The LightSail 2 mission is a game-changer for spaceflight and advancing space exploration," said Bill Nye, whose Planetary Society funded the project.
Settlements on the moon where astronauts will live permanently or semi-permanently are closer to becoming a reality than ever before.
The technology has the potential to revolutionize navigation in space and usher in a new era of exploration to far-flung worlds.
The space agency is hoping to put the first woman on the lunar surface by 2024.
"Mars is waiting to be discovered, not by clever robots and rovers, but by living, breathing, walking, talking, caring and daring men and women," the ex-astronaut wrote.
Ultima Thule is located around 4 billion miles away from the Sun.
Retired NASA astronaut Bill Anders also said that sending humans to Mars was a "stupid" idea.
Parker has surpassed the previous close approach record set in April 1976 by the German-American spacecraft Helios 2.
Venus's surface is an inhospitable wasteland. But its upper atmosphere is much like Earth.
A new study suggests that the Red Planet could have supported subsurface microbes.
Musk's Mars ambitions have started to look more like fantasy.
Long-distance space travel presents a number of challenges, including how to transport sufficient quantities of oxygen and fuel.
If successful, the probe will be the first privately funded unmanned spacecraft to land on the moon.
Around 200,000 people have signed up for Asgardian citizenship.