A Mars rock was expected to sell at auction for $4 million. The final bid was for more

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The largest piece of Mars to ever make its way to Earth is now also the most valuable meteorite in the world.
A chunk of the Martian surface that at some point crashed into Earth following an unlikely cosmic journey sold Wednesday, July 16 to an anonymous bidder for a record $5.3 million at a Sotheby's New York auction. The final price tag, which came after various fees and costs were added, is the most any meteorite of any origin has ever sold for at auction, Sotheby's said in a post on social media site X.
The sale also surpasses the $2-4 million the Mars rock was expected to fetch.
What is the Mars rock?
The large space rock, which has the scientific name of NWA 16788, had its Martian origins validated by the Meteoritical Society, which included it in its Meteoritical Bulletin, the global journal of record for meteor-related science.
The meteorite was previously on exhibit at the Italian Space Agency in Rome and at a private gallery in Arezzo, Italy, in Tuscany, before it landed in Sotheby's auction.
Mars rock sells for $5.3 million: Who bought it?
Marketed by Sotheby's as "the largest Martian meteorite ever found on Earth," the cosmic object was expected to sell for up to $4 million.
The final bid was $4.3 million. The official final sale price was then about $5.3 million after various fees and costs were added, multiple outlets reported, including the Associated Press and ABC News.
Sotheby's, a British-founded auctioneer of art and collectibles based in New York City, auctioned off the meteorite, along with more than 100 other items, Wednesday, July 16.
Sotheby's has not publicly identified the buyer.
What are meteorites?
Rocks in space are known as meteoroids. If those space rocks enter Earth's atmosphere, they become meteors that streak across the sky in events colloquially referred to as "shooting stars."
Meteors – or fragments of them – that survive their atmospheric trip and land on the surface without burning up become meteorites, according to NASA.
Martian meteorite is largest on Earth: How big is it?
The Martian meteorite is 54 pounds, or about the weight of a standard bag of cement.
Measuring nearly 15 inches by 11 inches by 6 inches, the space rock is approximately 70% larger than the next largest piece of Mars found on Earth. In fact, it is so large that it represents approximately 6.5% of all Martian material ever found on Earth.
How did Martian space rock get to Earth?
NWA 16788 was discovered Nov. 16, 2023, by a meteorite hunter in Niger's remote Agadez region in the Sahara Desert.
Featuring an unmistakable reddish Martian hue, NWA 16788's internal composition suggests it was blasted from the surface of Mars by a powerful asteroid strike. Intense enough to turn some of the meteorite's minerals into glass, the asteroid strike sent the rock hurtling through space, where it miraculously made it through Earth's atmosphere without burning up, Sotheby's said in an auction house video.
Because the meteorite shows signs of minimal Earthly weathering, and its chemical makeup has not significantly changed, experts believe it reached our planet in recent years.
On a planet mostly covered in water, discovering meteorites on land is incredibly rare.
And Mars meteorites are even more elusive on Earth. Of the more than 77,000 officially recognized meteorites, only 400 are Martian meteorites, according to Sotheby's.
Eric Lagatta is the Space Connect reporter for the USA TODAY Network. Reach him at [e-mail]
This article originally appeared on USA TODAY: Mars rock auction $5.3 million bid surpasses Sotheby's expectations
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