Now, a new stunning photo taken by Oribiter's HIRISE instrument shows a hole about 35 metres across.
A visible shadow shows an underlying cavern believed to be about 20 metres deep.
The hole was discovered by chance on images of the dusty slopes of the Red Planet's Pavonis Mons volcano.
It appears to be an opening to an underground cavern, partly illuminated to the right of the opening.
A new huge hole discovered on Mars. Image Credit: NASA, JPL, U. Arizona
As NASA explains, "Holes such as this are of particular interest because their interior caves are relatively protected from the harsh surface of Mars, making
them relatively good candidates to contain Martian life.
These pits are therefore prime targets for possible future spacecraft, robots, and even human interplanetary explorers."
This is not the first time, HIRISE has photographed a strange opening on Mars. A few years ago, scientists discovered a giant hole that measures about
330 feet (100 meters) in diameter and is located to the northeast of Arsia Mons, one of the largest volcanoes on Mars.
Scientists think the holes could be entrances to underground Martian caves.
Are these giant holes leading to a secret underground world on Mars?
The hole measures about 330 feet (100 meters) in diameter and is located to the northeast of Arsia Mons, one of the largest volcanoes on Mars.
Black spots have been discovered on Mars that are so dark that nothing inside can be seen.
Quite possibly, the spots are entrances to deep underground caves capable of protecting Martian life,
were it to exist. The unusual hole pictured above was found on the slopes of the giant Martian volcano Arsia Mons.
The above image was captured three weeks ago by the HiRISE instrument onboard the Mars Reconnaissance Orbiter currently
circling Mars.Credits: Credit: NASA, JPL, U. Arizona
According to experts studying the MRO's images, the feature is not an impact crater; it lacks a circular, raised or ejecta.
The hole's darkness is impenetrable because of its sufficient depth, so any details of the terrain inside it, cannot be seen.
The hole measures about 330 feet (100 meters) in diameter and is located to the northeast of Arsia Mons, one of the largest volcanoes on Mars.
THEMIS's image shows holes, which can be entrances to underground caves on Mars. Photo Credits: GE Cushing, TN Titus, JJ Wynne, USGS, USGS,
Northern Arizona University, and PR Christensen of Arizona State University
Obviously someone or something is responsible for the creation of these giant holes on Mars.
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Is this yet another entrance to a secret underground world on Mars? We have previously seen that a
A satellite of the planet Mars, Phobos, discovered by A.Hall in 1877 still attracts great attention.
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