The Moon May Be 40 Million Years Older Than Previously Believed

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The Moon may be 40 million years older than previously believed (Credit: NASA.gov/ Public Domain)

About 4.5 billion years ago, a Mars-sized planet smashed into the newly-formed Earth. The collision ejected a large amount of planetary debris into space. Scientists believe that due to the energy from the impact, the debris was initially molten. It solidified over time as the material cooled and eventually became the Moon. However, how quickly that happened is up for debate.

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