A recent discovery in the Sahara Desert has scientists rethinking their understanding of the solar system's early days. A meteorite, NWA 12774, found in 2019, reveals evidence of a lost planet that vanished from our cosmic neighborhood. This extraordinary find challenges long-held beliefs about the formation and evolution of planetary bodies.
The meteorite's unique chemistry, low in silica, initially pointed to a small asteroid as its origin. However, closer examination revealed something extraordinary. Tiny crystals of clinopyroxene, a mineral typically found in Earth's crust, were present, but with a twist. These crystals were loaded with aluminum, indicating they had formed under extreme pressure, far deeper within the planet than any small asteroid could manage.
This discovery led researchers to estimate the size of the parent body, suggesting it was a protoplanet, a planetary embryo, with a radius of at least 621 miles (1,000 kilometers). This size places it between the Moon and Mars, a surprising revelation. The protoplanet's existence challenges our understanding of planetary formation, suggesting that Earth's formation may have followed a different path than previously thought.
The story of this lost planet is still unfolding. Scientists speculate that it met its end in a violent collision, breaking apart and scattering its fragments across space. Some of these fragments may have ended up as part of the planets we know today, including Earth. This discovery highlights the potential for more lost worlds waiting to be uncovered in museum drawers, each with its own unique story to tell.
The implications of this finding are significant. It not only rewrites part of our solar system's history but also opens up new avenues for research. As we continue to explore the cosmos, the search for more protoplanets and their remnants becomes a thrilling prospect, offering a glimpse into the diverse and complex nature of our universe.
