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Pair of Giant Pandas from China Arrive Safely at San Diego Zoo

In this photo released by Xinhua News Agencym, giant panda Yun Chuan eats at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Yanan, southwest China's Sichuan Province on April 18, 2024. (Xue Chen/Xinhua via AP)
In this photo released by Xinhua News Agencym, giant panda Yun Chuan eats at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Yanan, southwest China's Sichuan Province on April 18, 2024. (Xue Chen/Xinhua via AP)
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Pair of Giant Pandas from China Arrive Safely at San Diego Zoo

In this photo released by Xinhua News Agencym, giant panda Yun Chuan eats at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Yanan, southwest China's Sichuan Province on April 18, 2024. (Xue Chen/Xinhua via AP)
In this photo released by Xinhua News Agencym, giant panda Yun Chuan eats at the Bifengxia Panda Base of the China Conservation and Research Center for the Giant Panda in Yanan, southwest China's Sichuan Province on April 18, 2024. (Xue Chen/Xinhua via AP)

Two giant pandas from China have safely arrived in Southern California, where they will be cared for as part of an ongoing conservation partnership, the San Diego Zoo Wildlife Alliance said Friday.
The pandas, Yun Chuan and Xin Bao, will spend the next several weeks acclimating to their new home in a private habitat at the San Diego Zoo and will not be viewable by the public, the alliance said in a brief statement.
“They are being monitored closely by expert wildlife health and care teams who will determine when the pair are ready to meet the public,” The Associated Press quoted the alliance as saying.
A farewell ceremony was held earlier this week before the pandas departed from China.
Yun Chuan, a mild-mannered male who’s nearly 5 years old, has connections to California, the wildlife alliance said previously. His mother, Zhen Zhen, was born at the San Diego Zoo in 2007 to parents Bai Yun and Gao Gao.
Xin Bao is a nearly 4-year-old female described as “a gentle and witty introvert with a sweet round face and big ears.”
The San Diego Zoo Wildlife Alliance has a nearly 30-year partnership with leading conservation institutions in China focused on protecting and recovering giant pandas and the bamboo forests they depend on.

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Biggest Piece of Mars on Earth is Going Up for Auction in New York

A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)
A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)
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Biggest Piece of Mars on Earth is Going Up for Auction in New York

A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)
A Martian meteorite, weighing 54.388 lbs. (24.67 kg), said to be the largest piece of Mars on Earth, estimated at $2 - 4 million, is displayed at Sotheby's, in New York, Wednesday, July 9, 2025, part of their Geek Week auction, July 16, 2025. (AP Photo/Richard Drew)

For sale: A 54-pound (25-kilogram) rock. Estimated auction price: $2 million to $4 million. Why so expensive? It's the largest piece of Mars ever found on Earth.

Sotheby's in New York will be auctioning what's known as NWA 16788 on Wednesday as part of a natural history-themed sale that also includes a juvenile Ceratosaurus dinosaur skeleton that's more than 6 feet (2 meters) tall and nearly 11 feet (3 meters) long, The Associated Press reported.

According to the auction house, the meteorite is believed to have been blown off the surface of Mars by a massive asteroid strike before traveling 140 million miles (225 million kilometers) to Earth, where it crashed into the Sahara. A meteorite hunter found it in Niger in November 2023, Sotheby's says.

The red, brown and gray hunk is about 70% larger than the next largest piece of Mars found on Earth and represents nearly 7% of all the Martian material currently on this planet, Sotheby's says. It measures nearly 15 inches by 11 inches by 6 inches (375 millimeters by 279 millimeters by 152 millimeters).

"This Martian meteorite is the largest piece of Mars we have ever found by a long shot," Cassandra Hatton, vice chairman for science and natural history at Sotheby's, said in an interview. "So it´s more than double the size of what we previously thought was the largest piece of Mars."

It is also a rare find. There are only 400 Martian meteorites out of the more than 77,000 officially recognized meteorites found on Earth, Sotheby's says.

Hatton said a small piece of the red planet remnant was removed and sent to a specialized lab that confirmed it is from Mars. It was compared with the distinct chemical composition of Martian meteorites discovered during the Viking space probe that landed on Mars in 1976, she said.

The examination found that it is an "olivine-microgabbroic shergottite," a type of Martian rock formed from the slow cooling of Martian magma. It has a course-grained texture and contains the minerals pyroxene and olivine, Sotheby's says.

It also has a glassy surface, likely due to the high heat that burned it when it fell through Earth's atmosphere, Hatton said. "So that was their first clue that this wasn't just some big rock on the ground," she said.

The meteorite previously was on exhibit at the Italian Space Agency in Rome. Sotheby's did not disclose the owner.

It's not clear exactly when the meteorite hit Earth, but testing shows it probably happened in recent years, Sotheby's said.

The juvenile Ceratosaurus nasicornis skeleton was found in 1996 near Laramie, Wyoming, at Bone Cabin Quarry, a gold mine for dinosaur bones. Specialists assembled nearly 140 fossil bones with some sculpted materials to recreate the skeleton and mounted it so it's ready to exhibit, Sotheby's says.

The skeleton is believed to be from the late Jurassic period, about 150 million years ago, Sotheby's says. It's auction estimate is $4 million to $6 million.

Ceratosaurus dinosaurs were bipeds with short arms that appear similar to the Tyrannosaurus rex, but smaller. Ceratosaurus dinosaurs could grow up to 25 feet (7.6 meters) long, while the Tyrannosaurs rex could be 40 feet (12 meters) long.

The skeleton was acquired last year by Fossilogic, a Utah-based fossil preparation and mounting company.

Wednesday's auction is part of Sotheby's Geek Week 2025 and features 122 items, including other meteorites, fossils and gem-quality minerals.