Apollo 15 astronauts found 4-billion-year-old 'Genesis Rock' on the Moon
Apollo 15 astronauts discovered an unusually bright rock near Spur Crater on the Moon. This sample, known as the Genesis Rock, is an anorthosite and about four billion years old. Scientists believe it represents a piece of the Moon's primordial crust. Its mineral composition offers valuable clues about early lunar geological history. This ancient sample continues to aid understanding of the…
On August 1, 1971, during the Apollo 15 lunar mission, astronauts David Scott and James Irwin discovered a 4-billion-year-old rock on the Moon. This rock, officially numbered 15415, was an anorthosite, a type of rock that formed the Moon's primordial crust. When they spotted a bright, white fragment near Spur Crater, a small feature on the lunar surface, they realized its significance.
NASA later determined that the rock was about 4 billion years old, making it one of the oldest samples ever collected from the Moon. The discovery was crucial for understanding the Moon's earliest crust, as anorthosite is formed when crystals of plagioclase, a mineral commonly found in this type of rock, float upward from a global ocean of molten rock.
The rock's location on Spur Crater's rim was also significant because impact events can bring deeper layers of rock to the surface, providing a window into the Moon's past. Although initially considered the oldest lunar rock, subsequent research suggested that it may not be the absolute oldest. Nevertheless, the Genesis Rock remains a vital piece of lunar history, offering insights into the Moon's violent birth and the formation of its ancient crust.
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