Moon Has Been Slowly Moving Away from Earth Every Year

Bumi dilihat dari Bulan.
Bumi dilihat dari Bulan.
Sumber :
  • New Scientist

VIVA – In 1969, the Apollo mission installed reflective panels on the Moon. These have shown that moon is currently moving 3.8 cm away from the Earth every year. Looking at the current rate of lunar recession and projecting it into the past, Earth and Moon would have collided about 1.5 billion years ago.

But the Moon formed about 4.5 billion years ago, which means that the current rate of recession is a poor guide to the past, according to the Space website, Tuesday, October 18, 2022.

The University of Utrecht and the University of Geneva have used a combination of techniques to try and gain information about the solar system's past.

"We recently found the perfect place to uncover the long-term history of our Moon. And that's not from studying the Moon, but from reading signals in ancient rock layers that exist on Earth," Researchers stated. 

Lapisan batuan putih, kemerahan dan abu-abu kebiruan di Karijini National Park

Lapisan batuan putih, kemerahan dan abu-abu kebiruan di Karijini National Park

Photo :
  • Frits Hilgen

In the Karijini National Park in Western Australia, some gorges cut through 2.5-billion-year-old, rhythmically layered sediments. These sediments are banded iron formations, comprising distinctive layers of iron and silica-rich minerals once widely deposited on the ocean floor and now found on the oldest parts of the Earth’s crust.

Exposure to the cliffs at Joffre Falls shows how layers of reddish-brown iron formation less than one meter thick are periodically interspersed by darker and thinner horizons.

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