The Moon May Be 40 Million Years Older Than Previously Believed
Language
Reading Level
Listen to Article
Alignment
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.
Previous research estimated that the Moon formed about 4.42 billion years ago. However, a recent study asserts that our satellite is 4.46 billion years old. This is 40 million years older than previously thought.
The team, led by Jennika Greer at the University of Glasgow, Scotland, arrived at this conclusion after studying lunar rock samples. They were brought back in 1972 as part of the Apollo 17 mission. It was the last time astronauts went to the Moon.
More specifically, the scientists sought out the zircon crystals present in the rocks. The mineral is believed to be the first to have crystallized when the Earth's molten debris cooled.
The researchers began by using ultraviolet lasers to evaporate atoms from the zircon crystals. The mineral contains radioactive uranium, which turns to lead over time. The process is called radioactive decay. The proportion of the uranium to lead atoms indicated that the zircon crystals were 4.46 billion years old. The scientists believe the mineral's age provides a more accurate estimate of when the Moon formed. The findings were published in the journal Geochemical Perspectives Letters in June 2023.
"When the surface was molten like that, zircon crystals couldn't form and survive. So any crystals on the Moon's surface must have formed after this lunar magma ocean cooled," says study co-author Philipp Heck at the University of Chicago. "Because we know how old these crystals are, they serve as an anchor for the lunar chronology."
Resources: theguardian.com, Livescience.com, Space.com
Get the Workbook for this article!
Workbook contains: Article, Reading Comprehension, Critical Thinking Questions, Vocabulary in Context (+ answers), Multiple Choice Quiz (+ answers), Parts of Speech Quiz (+ answers), Vocabulary Game (+ answers)Cite Article
Learn Keywords in this Article
37 Comments
2_knownn9 monthsthis was cool- mhluska9 monthsOMG THIS WAS MY FAVORITE ARTICLE EVERRRR SO INFORMATIVEEE
doger279 monthswatttt so cool
basketball111310 monthsyeah this is so rad
carsonmcmurray10 monthsI love space its so interesting.
pupehefyzire10 monthsLife and its discoveries are so interesting,I LOVE SPACE!- basketball11139 monthsI totally agree
- carsonmcmurray10 monthsI know right
- pupehefyzire10 monthsThis article is so informational!LOVE IT!!!!!!!!!
koreaisthebest410 monthsnice
tls12310 monthsthats cool! >:D- tls12310 monthscool :D
