A small meteor may reshape our understanding of asteroids


Scientists have released an analysis of the fragments of a meteorite collected after the 2008 asteroid’s collision with Earth. They show that the parent asteroid was very large, and the results suggest that particular, water-holding types of asteroids may be larger and have different mineral compositions than before.

The findings of the study were Published this week See the chemical composition of fragments of those meteorites in the journal Nature Astronomy.

The story of the fragments begins in October 2008, when scientists came to know about an asteroid on a collision course with Earth. They knew that most of the rock would burn when it entered the Earth’s atmosphere, and that the remnants, if any, would fall into the Nubian Desert’s wind sands. This provided a unique opportunity for an international team of researchers, NASA scientists among them, to anticipate the arrival of the rocks and then comb the sand for any living pieces.

Although the asteroid was relatively small – only about nine tons – its encroachment was less than zero; Less than 8.8 pounds (4 kg) Meteorites were collected from the desert. After the nearby train station, she was collectively called Alamhata Sita. This was the first time an asteroid had been sighted and then the remains of its meteorite were collected.

Since its recovery, individual fragments from the almighty Sita have been analyzed, revealing information about the origin and chemical compositions of various parts of the asteroid. The team studied the meteorite sampleDabbed Ahs 202- was small enough that you could fit 10 copies of it onto a nailhead, but it came from a Guardian space rock, a point of origin, before the piece was joined with the rocky mass of Alhamta Bitta . The team used infrared and X-ray light to study the sample. They discovered that the fragment was a carbonaceous chondrite, a type of meteorite that formed during the early days of the Solar System, and which may have brought water to Earth … giving rise to all this. Carbonaceous chondrites were generally not able to come from parent bodies (original asteroids) larger than 62 miles (100 kilometers) in diameter.

But researchers found the tremorite in its dirty-crumbling crumb, a mineral that requires enormous amounts of pressure to form. The existence of tremolite in the sample reveals the extent to which the diameter of the original asteroid is More than 398 1,119 miles (1,800 kilometers over 640), Putting it in the wheel of Ceres, the biggest thing –A dwarf planet, actually– In the asteroid belt.

Vicky Hamilton, a staff scientist at the Southwest Research Institute and the lead author of the recent paper, said, “This is a testament to a much larger parent body that we didn’t know about before.” Of Completed in a carbonaceous chondrite. “The fact that we do not have other evidence of this in our meteorite collection helps confirm what we already suspect, which is that the meteorites we manage to find on Earth are one. Are biased specimens. “

As asteroids move through space, they are bound to make contact with other bodies. These groups of metals and minerals come together and break up as their trajectory continues. When a meteorite is actually found on Earth, it is a globebed-together collection of stories from space, and the only way to read it is a whole bunch of analyzes.

“You can see one group of scientists looking at one piece of meteorite and another group looking at another piece of the same meteorite, and you will see two different parts of the history of the solar system,” Hamilton said.

In this way Hamilton’s murderer could point to some origin in a large-scale asteroid, while the Almahata could indicate another piece of Sita. Survival of a proto-planet. A recent type of reverse engineering the electroscopy team has done is to look at its specific story like a specific space rock, in which case it is in reference to a large parent asteroid. This is like finding a piece on your kitchen counter – it can be from anywhere – but looking at it chemically can tell you the temperature and pressure conditions, and whether this piece is on this morning’s toast or last week’s birthday Whether the cake came from or not.

Although much rarer than other types of asteroids, new information about carbonaceous chondrites may fall from the sky at any time. It’s just a matter of whether meteorologists are cautious or lucky – enough to spot them.

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