SIX scientists have entered a domed structure on Mauna Loa, on the Big Island of Hawaii, a research facility intended to simulate an expedition to Mars.

The study - known as the Hawaii Space Exploration Analog and Simulation study - will last eight months.

The group entered the 1,200-square-foot research facility on Thursday. They will have no physical contact with any humans outside their group, experience a 20-minute delay in communications and will be required to wear space suits whenever they leave the compound.