The Northwest Africa 12264 meteorite is older than expected
Ben Hoefnagels
A recent study on a small meteorite has challenged existing theories about the formation of the solar system. Tiny shavings from the meteorite, known as Northwest Africa 12264, have provided new insights that could revolutionize our understanding of planetary formation.
Previous research indicated that protoplanets in the outer solar system formed slightly later than those closer to the center. This difference in timing was attributed to the presence of more water and ice in the outer bodies, slowing down the melting of an inner core. However, a team led by Ben Rider-Stokes from The Open University has now found evidence that contradicts this long-held belief.
The study focused on Northwest Africa 12264, a meteorite weighing around 50 grams, which was acquired in 2018. Analysis of the meteorite’s composition revealed that it originated in the outer solar system and was part of a planetary mantle. Surprisingly, isotopic dating of the meteorite suggested that it was among the oldest materials in the solar system, challenging the idea that outer protoplanets formed later than those in the inner solar system.
According to Rider-Stokes, this discovery indicates that rocky planets in both the inner and outer solar system formed simultaneously, contrary to previous assumptions. The implications of this finding could lead to a reevaluation of current models used to explain planetary formation.
Sebastiaan Krijt from the University of Exeter emphasized the significance of accurately understanding the chronological events that shaped our solar system over 4 billion years ago. Even a slight adjustment in timing could have a substantial impact on our knowledge of planetary formation processes, both within our solar system and in other star systems.
As researchers continue to unravel the mysteries of our cosmic origins, studies like this highlight the importance of refining our understanding of how planets, including Earth, came into existence.
