Meteorites, Meteoroids, Meteors, Comets, and Asteroids; [and Bolides if you wish:]

[beecee]

https://phys.org/news/2019-04-tiny-fragment-comet-meteorite.html

Tiny fragment of a comet found inside a meteorite: 

A tiny piece of the building blocks from which comets formed has been discovered inside a primitive meteorite. The discovery by a Carnegie Institution of Science-led team, including a researcher now at Arizona State University, was published April 15 in Nature Astronomy.

The finding could offer clues to the formation, structure, and evolution of the solar system.

"The meteorite is named LaPaz Icefield 02342," says research scientist Jemma Davidson of ASU's Center for Meteorite Studies in the School of Earth and Space Exploration. "The name comes from where it was found in Antarctica's LaPaz Icefield."

She adds that it belongs to a class of primitive carbonaceous chondrite meteorites that have undergone minimal changes since they formed more than 4.5 billion years ago, likely beyond the orbit of Jupiter.

 

more at link:

the paper:

https://www.nature.com/articles/s41550-019-0737-8

A cometary building block in a primitive asteroidal meteorite:

 

Abstract:

Meteorites originating from primitive C-type asteroids are composed of materials from the Sun’s protoplanetary disk, including up to a few per cent organic carbon. In contrast, some interplanetary dust particles and micrometeorites have much higher carbon contents, up to >90%, and are thought to originate from icy outer Solar System bodies and comets. Here we report an approximately 100-µm-diameter very carbon-rich clast, with highly primitive characteristics, in the matrix of a CR2 chondrite, LaPaz Icefield 02342. The clast may represent a cometary building block, largely unsampled in meteorite collections, that was captured by a C-type asteroid during the early stages of planet formation. The existence of this cometary microxenolith supports the idea of a radially inward transport of materials from the outer protoplanetary disk into the CR chondrite reservoir during the formation of planetesimals. Moreover, the H-isotopic composition of the clast is suggestive of a temporal evolution of organic isotopic compositions in the comet-forming region of the disk.

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The sentence highlighted in the Abstract....Is this support for Planetary Migration? A hypothesis I believe has come about due to the observations of extra stellar planets that have been discovered and the many  "hot Jupiters"among them, being close to their parent star.

The other point that I raise is that the article could have been more informative? Meteorites are the remains of meteoroids/meteors that survive entering the Earth's atmosphere, and are all left over debris from the formation of the solar system. Comets are also the left over remnants from the solar system formation, perhaps originating further out and so acquired water ice. Comets essentially are meteoroids/meteors covered with this water ice and other frozen impurities and in the course of time, will end up being just plain old meteoroids. Finally Asteroids are larger versions of meteoroids/meteors/comets. 

If I'm correct with the above, I believe that this should have been mentioned in the article.

Edited April 16, 2019 by beecee