• live_July_4th,_early,_looking_at_moon_through_telescope.__20230704_013344

  • Jul 4 2023
  • Duración: 1 h y 5 m
  • Podcast

live_July_4th,_early,_looking_at_moon_through_telescope.__20230704_013344

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  • Most scientists believe the rate at which the moon and Earth have been bombarded by meteorites has remained constant for the past two to three billion years. Understanding the age of craters on the moon can help us better understand the age of our own planet because the Earth would have received similar numbers of impacts. It’s been assumed that the rarity of young craters on Earth (those created 300-600 million years ago) is attributed to preservation bias — craters have been erased over the years by erosion and the movement of the Earth’s plates. Since then however, using a new method to date craters on the moon, my colleagues and I have determined that the rarity of craters 300-600 million years is due to a lower bombardment rate. In fact, the bombardment rate has increased by a factor of two to three in the past 300 million years. To test this idea, we compared the Earth’s crater record to the moon’s in an article published in the journal Science . We suggest that the scarcity of terrestrial craters that are 300-650 million years old is simply due to a lower bombardment rate during that period — and not due to preservation bias. Using rock abundance data from the Lunar Reconnaisance Orbiter to determine ages for lunar craters. Rebecca Ghent, University of Toronto and Thomas Gernon, University of Southampton, Author provided Dating craters The moon’s surface serves as a time capsule, helping us to detangle Earth’s history. There are tens of thousands of craters on the moon and the only way to see if the bombardment rate has changed is to have an age for every single crater.
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