Members of the media tour inside the Mars landscape simulation area at Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A recreational area is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A lavatory is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A washing machine and exercise equipments are seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A trash can and instructions are seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A 3D printer is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A kitchen area is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A Crew quarter is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

Plant pods to grow vegetables are seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

Exercise equipments are seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

Cleaning supplies are seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A working area is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

An oxygen generator system is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

Instruments are seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

Computer monitors are seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A working area is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A CHAPEA logo, Crew Health and Performance Exploration Analog, is seen on the entrance door of the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A working area is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A working area is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A medical bay is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A glove box is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A medical bay is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A NASA logo is seen in a working area inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

A light fixture and a monitoring camera are seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

The door for the airlock room is seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

VR goggles are seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

Instruments are seen inside the Mars landscape simulation area at Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

The floor plan of the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, is seen at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

An instrument seen inside the Mars landscape simulation area at Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura 

Boots are seen inside the Mars Dune Alpha, NASA's simulated Mars habitat, being used as preparations for sending humans to the Red Planet, at the agency's Johnson Space Center in Houston, Texas, U.S. April 11, 2023. REUTERS/Go Nakamura