A 25-kilogram rock, believed to be the largest piece of Mars ever discovered on Earth, is set to be auctioned by Sotheby’s in New York with an estimated price of $2 million to $4 million US. The meteorite, known as NWA 16788, was found in Niger in November 2023 after being blown off Mars by an asteroid strike and traveling 225 million kilometers to Earth. It is approximately 70% larger than the next biggest piece of Martian material found on Earth, making up nearly 7% of all Martian material on the planet.
Cassandra Hatton, vice-chair for science and natural history at Sotheby’s, described the Martian meteorite as a significant discovery, emphasizing its rarity among the more than 77,000 recognized meteorites on Earth. Only 400 Martian meteorites have been identified, with NWA 16788 standing out as the largest known piece.
A portion of the meteorite was analyzed in a specialized lab, confirming its Martian origin based on its unique chemical composition. The examination revealed that it is an olivine-microgabbroic shergottite, a type of Martian rock formed from the slow cooling of Martian magma. The meteorite’s glassy surface, likely a result of the intense heat it experienced upon entering Earth’s atmosphere, further distinguishes it as a remarkable find.
Additionally, a juvenile Ceratosaurus dinosaur skeleton, standing over two meters tall and nearly three meters long, will also be auctioned as part of Sotheby’s natural history-themed sale. The skeleton, believed to be from the late Jurassic period around 150 million years ago, is estimated to fetch $4 million to $6 million US. Ceratosaurus dinosaurs, resembling smaller versions of the Tyrannosaurus rex, were bipedal creatures that could reach lengths of up to 7.6 meters.
The upcoming auction, part of Sotheby’s Geek Week 2025, will feature a total of 122 items, including various meteorites, fossils, and gem-quality minerals, showcasing a diverse array of natural history treasures.
Wednesday’s auction promises to be an exciting event, offering collectors and enthusiasts the opportunity to acquire rare and significant pieces of Earth’s natural history.