How much older is the moon than previously thought?

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The Moon is Approximately 40 Million Years Older Than Previously Estimated

Analysis of zircon crystals within lunar rock samples collected during the Apollo 17 mission has revealed that the Moon formed over 4.46 billion years ago, approximately 40 million years earlier than prior scientific consensus suggested. This places the Moon's formation within 110 million years of the solar system's inception, offering a refined timeline for this significant celestial event.
Lunar Rock Samples Provide New Age Data

The key to this revised understanding lies in a fragment of igneous rock, specifically a type called norite, collected by astronaut Harrison Schmitt in 1972. Contained within this sample are ancient zircon crystals. These crystals are among the oldest known solids to have formed after the cataclysmic event believed to have created the Moon, an event theorised to have involved a Mars-sized object named Theia colliding with early Earth.
Advanced Techniques Confirm Crystal Age

Utilising a sophisticated method known as atom probe tomography, scientists were able to precisely date the zircon crystals. This technique allowed for the confirmation of the age of the oldest solids that solidified after the giant impact. Previous studies, such as one published in 2021, used uranium-lead dating, but the new approach provided a crucial confirmation by ruling out potential complications related to lead atoms within the crystal structure.
Zircon Crystals Preserve Ancient Records

Zircon crystals are exceptionally durable minerals, making them ideal for preserving records of the early solar system. Their resilience allows them to survive geological processes and weathering over billions of years. The fact that zircons are the oldest minerals found on Earth, Mars, and the Moon underscores their significance in understanding planetary and lunar formation histories.

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