✨Moon Had Strong Magnetic Field 4.2 Billion Years Ago
The Moon once had a magnetic field stronger than Earth's
TL;DR
ETH researchers confirm the Moon had a magnetic field 4.2 billion years ago, similar to Earth's. The study uses data from lunar orbit probes, revealing a dense, strongly magnetized rock body beneath the lunar surface.
ETH researchers have confirmed the Moon had a magnetic field 4.2 billion years ago, similar to Earth's. This discovery is significant for understanding the Moon's internal structure and its magnetic evolutionary history. The study uses data from lunar orbit probes, including gravity measurements from NASA's GRAIL mission and magnetic field models from Lunar Prospector and Kaguya missions. Beneath the lunar surface lies a rock body approximately 60 kilometers wide, extending to a depth of around 9 kilometers, which is much denser and strongly magnetized than the surrounding crust. This finding challenges previous contradictory evidence from Apollo rock samples and supports the dynamo theory.
Key Points
ETH researchers used data from NASA's GRAIL mission to confirm the Moon's ancient magnetic field.
The magnetic field was between one-fifth and one-third of Earth's current strength, stronger than 10 microtesla.
A dense, strongly magnetized rock body, approximately 60 kilometers wide, lies beneath the lunar surface.
The rock body extends to a depth of around 9 kilometers, much denser than the surrounding crust.
The study rules out the possibility of a violent impact causing the magnetic field, supporting the dynamo theory.
Why It Matters
The Moon's ancient magnetic field, confirmed by ETH researchers, provides new insights into its internal structure and magnetic history. This discovery challenges previous contradictory evidence from Apollo rock samples and supports the dynamo theory. Understanding the Moon's magnetic field can help in the analysis of lunar samples and draw conclusions about its evolutionary history.
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