Ancient Meteor Strike in Rajasthan Points to Core of a Lost Planet
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New evidence from the Ramgarh crater in Rajasthan, India, suggests the region was struck by a massive iron meteorite approximately 165 million years ago, potentially a fragment of a long-lost planetary core.
New Delhi – Scientists have uncovered compelling evidence of an ancient impact event in Rajasthan, India, pinpointing the Ramgarh Crater as the result of a collision with an iron-rich meteorite. The discovery, centered around uniquely shaped magnetic particles found within the crater, offers a glimpse into the Solar System’s tumultuous past and the building blocks of planets.
Unearthing Evidence of a Cataclysmic Impact
The Ramgarh Crater, measuring 2.4 kilometers in width and embedded in rocks over a billion years old, has long been suspected as the site of an asteroid impact. Recent analysis has revealed the presence of impact spherules – small, round, magnetic particles – within the crater’s soil. These spherules exhibit aerodynamic shaping, indicating they were molded by the intense friction of atmospheric flight, a characteristic of material ejected during a high-energy impact.
Researchers excavated trenches up to one meter deep, strategically positioned near the crater’s center and edge, to collect soil samples. Using magnets, they isolated magnetic grains, which were then meticulously examined under microscopes. The particles, less than a millimeter in diameter, are described as black, glassy, and pitted, closely resembling glass balls formed during other known impact events.
Metallic Signatures Point to a Planetary Core
Previous studies had already identified magnetic glassy fragments containing traces of iron, cobalt, and nickel within and around the crater, hinting at the meteorite’s composition. The latest research confirms this hypothesis. Tests reveal the spherules are primarily composed of silicon, iron, and nickel, with iron levels ranging from 10 to 75 percent and nickel reaching up to 25 percent. Notably, one larger grain exhibited iron-rich areas with smaller amounts of nickel.
“The local rocks have very little iron or nickel,” researchers noted, “so these elements likely originated from the asteroid itself.” This concentration of iron and nickel strongly suggests the impacting body wasn’t a typical rocky asteroid, but rather a fragment of a differentiated world – a planet or planetesimal with a core, mantle, and crust.
A Window into the Solar System’s Early History
The findings provide compelling evidence that the Ramgarh Crater was formed by an iron meteorite. Scientists believe such metallic asteroids are remnants of the cores of ancient, shattered planets that existed during the chaotic early stages of the Solar System. These worlds, subjected to relentless bombardment, were broken apart, leaving behind metallic fragments like the one that impacted Rajasthan.
“It is only at the cores of differentiated worlds with a core, mantle and crust, that such high concentration of metals such as iron and nickel are formed,” one analyst explained. The asteroid Psyche, a metallic asteroid currently being explored by NASA, is another example of this type of celestial body.
The ongoing research promises to reveal further details about the composition and origin of the meteorite, offering valuable insights into the formation and evolution of our Solar System. The Ramgarh Crater, once a site of destruction, now serves as a unique window into a fragment of a long-lost world.
