Rock on top asteroid New research has found that it can result in more than three-quarters of cavities, a discovery that can help generate insights into how the Earth and other planets were formed.
The early stages of planet formation began with building blocks known as planetesimals, which are rock masses of asteroid-to-asteroid size. Dwarf planet.. Previous studies have suggested that planetesimals may have started as a very porous, fluffy mass of dust whose heat, gravity, and impact are compressed over time. However, this idea has not yet been proven, Naoya Sakatani, a planetary scientist at Rikkyo University in Japan and the lead author of the study, told Space.com.
Recently in Japan Hayabusa2 The spaceship discovered it RyuguA diamond-shaped near-Earth asteroid with a width of 2,790 feet (850 meters) is about 30% to 50% porosity.. Now, Sakatani and his colleagues say that those rocks may be more than 70% free space, or as porous as previous studies suggested by ancient planetesimals. discovered.
Researchers used the Hayabusa2 infrared camera to analyze the surface of Ryugu and found two isolated hotspots. The spacecraft telescope captured high-resolution images from one of them, revealing that it had a cluster of boulders near the center of the crater, about 30 feet (9 m) wide.
The more porous parts of Ryugu, the less material there is and the easier it is to heat. Based on the heat from these hotspots, scientists estimated that the boulder clusters in the first hotspot were 72% to 91% porous. It was not possible to confirm the presence of boulders in other hotspots, but the heat detected suggested that the rock was approximately 71% porous.
Researchers have found that Ryugu’s hotspot rocks Comet..Previous studies have pointed out that comets are likely Wreckage of the original planetesimal, And Sakatani and his colleagues suggested that the rocks at Ryugu’s hotspot may be the wreckage of an ancient planetesimal as well. And it is the impact of the universe exploding from under the surface of Ryugu.
One of the possible origins of these highly porous boulders is that they were formed after the impact of the universe. However, Hayabusa2 fired a shell at Ryugu, and no similar porous rocks were found to appear as a result of its artificial impact, and the porous rocks on the asteroid did not arise from the collision. Suggests.
Revealing details about the true nature of planetesimals can shed light on how the planets were formed.For example, a scientist As mentioned above If the planetesimals are more and more fluffy enough to be suspected by researchers, they may be more prone to collapsing during collisions and less likely to release debris with great force to crush other asteroids. ..
2019 Hayabusa2 Captured sample From the surface of Ryugu and successfully Returned these specimens to Earth In December 2020. These samples are highly porous and may contain very old rocks, which may help clarify further about their properties. Solar system building blocks.. However, Sakatani said that analyzing this rock would prove difficult “due to its fragile nature.”
Detailed scientist Their discovery Journal Nature Astronomy May 24th Online.
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The rocks of the asteroid Ryugu are surprisingly fluffy, discovered by the Hayabusa2 spacecraft in Japan.
Source link The rocks of the asteroid Ryugu are surprisingly fluffy, discovered by the Hayabusa2 spacecraft in Japan.