That rare group is the “angrites,” which account for just 0.09% of all meteorites. They\u2019re among the oldest known rocks in the solar system<\/a>, forming within just a few million years after the solar system began 4.56 billion years ago. They also contain exceptionally low levels of silica (silicon dioxide), which is a key ingredient of most asteroids and rocky planets.<\/p>\n <\/p>\n One angrite meteorite, dubbed NWA 12774<\/a>, (pictured here in cross-polarized light) was discovered in the Sahara Desert in 2019. And a new study into this space rock suggests that it could be the first definitive evidence of a long-lost protoplanet that once existed in the early solar system. (NWA stands for Northwest Africa, a designation given to every meteorite found in this region.)<\/p>\n The findings, published July 1 in the journal Earth and Planetary Science Letters<\/a>, hint that this \u201cplanetary embryo\u201d \u2014 if it existed \u2014 was made of angrite and may have been as big as the moon<\/a> or even Mars<\/a>. It\u2019s thought to have orbited the sun before crashing into another celestial body and shattering into rubble billions of years ago; cue angrite meteorites falling to Earth.<\/p>\n In addition to its low silica content, NWA 12774 contains clinopyroxene, a mineral commonly found in Earth\u2019s crust and mantle. This clinopyroxene is also unusually rich in aluminum, indicating that it formed under extremely high pressure \u2014 possibly a high-energy collision.<\/p>\n You may like<\/p>\n Such pressures could not have existed inside a small asteroid, hinting that the parent body of the angrites must have had a radius of at least 621 miles (1,000 kilometers), the researchers wrote. The sharp edges on NWA 12774 further suggest it formed near the surface, implying the parent body was even larger \u2014 with a radius of up to 1,118 miles (1,800 km). For comparison, Earth\u2019s moon has a radius of 1,080 miles (1,737 km), and Mars has 2,106 miles (3,390 km).<\/p>\n \n Another view of the angrite meteorite NWA 12774.<\/p>\n (Image credit: CU Boulder\/John Kashuba)<\/p>\n \u201cIt\u2019s incredible to think there was once [another] world this large,\u201d study first author Aaron Bell<\/a>, a petrologist at the University of Colorado Boulder, said in a statement<\/a>. \u201cWe only know it existed because a few fragments of it happened to land on Earth. These meteorites preserved evidence of a completely different pathway through which early planets developed.\u201d<\/p>\n Due to the lack of silica in the angrites, scientists had previously theorized that these meteorites originated from small asteroids. But the new findings challenge that view.<\/p>\n If they did originate from a protoplanet, then the world that could have formed from this “embryo” would have likely looked much different than the rocky planets we see today.<\/p>\n \u201cThe materials that formed the angrite parent body are fundamentally different from the ingredients of Earth and Mars,\u201d said Bell. \u201cIt points to a distinct and separate evolutionary path in planetary formation in the early history of our solar system.\u201d<\/p>\n It is unclear exactly what happened to the lost protoplanet. However, the researchers speculate that some of its fragments may have become the building blocks of other terrestrial planets, including Earth.<\/p>\n Bell, A. S., Waters, L., & Ghiorso, M. (2026). High-pressure clinopyroxene in Northwest Africa 12774 and new geobarometric evidence for a planetary embryo-sized angrite parent body. Earth and Planetary Science Letters, 685, 120029. https:\/\/doi.org\/10.1016\/j.epsl.2026.120029<\/a><\/p>\n![\"A](\"https:\/\/www.newsbeep.com\/nz\/wp-content\/uploads\/2026\/06\/xEKsTk7vT6wjqXmK3tqHrK.jpg\")
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