Astronomy on MSN4d
The Moon’s epic ‘grand canyons’ were gouged out in 10 minutes by an asteroid strikeThe vast valleys of Vallis Schrödinger and Vallis Planck demonstrate the incredible forces that shaped the face of the Moon.
First, that the Grand ... the canyon is discussed to explain what the layers tell us about how the canyon formed. Every human step into the canyon represents about 20,000 years' worth of erosion.
The Earth's Grand Canyon took millions of years to carve, but the moon's grand canyons took about ten minutes.
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