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Article: Nasa has admitted that a massive hole on Mars could be a "portal" leading to an underground world of alien life. The American space agency shared an image of the 300-foot-wide opening in the Martian landscape as its Astronomy Picture of the Day.
Rather than leave people guessing, Nasa suggested the giant hole appears to lead to a mysterious "lower level" that may support life. The perfectly rounded hole spans roughly 328 feet and is located in the upper-right portion of a satellite photo taken by the Mars Reconnaissance Orbiter in 2017.
The cavity is surrounded by a circular crater, making the discovery even more mysterious. Nasa described the landscape as "Swiss cheese-like" with numerous holes showing "dusty, dark, Martian terrain beneath evaporating, light, carbon dioxide ice".
"Holes such as this are of particular interest because they might be portals to lower levels that extend into expansive underground caves," Nasa researchers said. "If so, these naturally occurring tunnels are relatively protected from the harsh surface of Mars, making them relatively good candidates to contain Martian life," they added.
Nasa also noted these pits are "prime targets for possible future spacecraft, robots, and even human interplanetary explorers."
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