- Asteroid influences on earth are hidden by erosion, but the month holds an unbroken record of her.
- Researchers date 111 larger craters on it month to reconstruct the history of the Earth over the past 1 billion years.
- The team discovered that larger asteroid bands were 2.6 times more common in the last 300 million years of that period.
- An animation gives the impact data with light and sound.
The month paved a great secret about earth in emptiness.
Evidence of old asteroid stripes is not found on our planet. In fact, fewer than 200 craters are known for science. The reason why this was simply understood was that the earth soon surpassed, rescued, and otherwise also had great influence.
The month, however, seems like a time capsule because it has no air, water, or active geology, so its craters do not disappear. And it just happens to be the planet, which means that everything that has happened to the moon speaks what happened to the earth.
So a new study published this week in a journal Science has a high look at the biggest moon critters. By pointing out and creating such effective web sites, say the researchers, a roughly asteroid history can be reconstructed at & # 39; the earth can be reconstructed.
"The month is like a time capsule, to help us understand the Earth," said Willem Bottke, a scientist in the Southwestern Institute, in a press release on the new study. "We found that the month shared a similar bombing history, meaning that the answer to & # 39; the consequence of & # 39; the earth's everyone was right in the face."
The story of foreign assumptions about the history of Earth
The post-work research team studied very detailed images of monthly and thermal data recorded by NASA's Lunar Reconnaissance Orbiter (LRO) for the ages of & # 39; pull out larger craters. Having completed their analysis, 111 major influences had been dated over one billion years.
The & # 39; a team's findings suggest that the month fewer craters will stay that high in & # 39; the earliest 700 million years from & # 39; the time of & # 39; a time, while great warfare for 260% was increasingly frequent in the last third.
This led the researchers to conclude that water and water on earth probably do not hide as many important effective websites as scientists think earlier.
"The earth does not have less older craters on solid terrains due to degradation, but because the impact of impact was over 290 million years ago," Bottke said in a release.
Bottke and his colleagues have not suggested that their discoveries mean we have to worry about some major asteroid strikes. Perhaps the procession can be a timely concern by "the breakage of one or more major asteroids into the inner and / or central main asteroid".
The work must be useful to researchers who try to understand the history and complex relationship with life.
"Our findings also impact on the history of life, which is punctured by points of extinction and rapid evolution of new species," said Bottke. "Although the forces driven by these events are complicated, asteroid influences have certainly played a role in this ongoing story."
View the past 1 billion years of large lunar asteroid stripes
The researchers at Southwest Research Institute gave 1.3 billion years ago the value of lunar impact data to System Sounds animators, which compressed this history into two minutes of movies (one not shown here) .
The animation above it illustrates 111 from one month's larger infiltrates to sound and color, and to & # 39; e order to prevent them. Smaller craters are represented by higher and quieter sounds, while the largest echoes are and lower.
In & # 39; the last third of the video, you see that there is a storage in lower and lower sounds.
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