NASA has released a photograph of a huge drawing of a man which is visible from space.
The so-called "Marree Man", an enormous geoglyph spanning 2.2 miles (3.5km) from head to toe, stands out from the barren landscape of the South Australia desert.
NASA released a photo of the hunter holding a stick – or possibly a boomerang – in his hand as its Image of the Day on Sunday.
It was taken by the Operational Land Imager (OLI) on June 22, 2019.
The geoglyph is not far from the town of Marree – from where it gets its name – some 365 miles (589km) from the city of Adelaide.
UFOs, Aliens and Outer Space
It was first spotted in 1998 when a pilot noticed the carvings on a plateau, but it has faded as time went on.
According to NASA, the lines were barely visible in natural colour images collected in 2013 by OLI on Landsat 8.
In response, workers began a five-day restoration project to save the drawing of the hunter from decaying even further.
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GPS coordinates and a construction grader were used to bring the image back to its former glory.
The team created wind grooves in the geoglyph, which they hope will allow plants to grow in the desert.
This means that in the future, the Marree Man could be green.
Since its discovery, there have been a number of theories as to where the Marree Man came from.
These range from members of the US army to a local Australian artist who died in 2002.
Nobody has ever come forward to claim responsibility for creating the geoglyph, but a number of clues have been left, including a series of faxes from an anonymous sender.
The faxes led to the discovery of an American flag near the man and a note citing the Branch Davidians.
They were a bizarre US religious cult involved in the Waco siege in Texas in 1993.
Also found were a plaque with an American flag and Olympic rings.
Another popular theory is that the geoglyph was created by eccentric Alice Springs artist Bardius Goldberg.
In 2018, Richard Wedding, a friend of the late artist, claimed he had told him on his deathbed that he was the creator, but swore for him not to tell anyone.
A $5,000 (£3,807) reward has been offered for anyone who can solve the mystery of its origins.
Dick Smith, an entrepreneur offering the reward, told ABC Radio Adelaide: "There have been so many different claims and the only one I don't believe in is that it was done from outer space."
The most famous geoglyphs in the world are the Nazca Lines in Peru.
These huge structures covering some 1,000 square kilometres have long baffled experts, with explanations ranging from drawings for ancient gods to landing strips for aliens.
Last month, Japanese scientists discovered 142 new Nazca Lines through sophisticated digital mapping, including ones depicting two-headed snakes and mysterious "humanoids".
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