Keith Cooper is a freelance science journalist and editor in the United Kingdom, and has a degree in physics and astrophysics from the University of Manchester. He's the author of 'The Contact Paradox: Challenging Our Assumptions in the Search for Extraterrestrial Intelligence' (Bloomsbury Sigma, 2020) and has written articles on astronomy, space, physics and astrobiology for a multitude of magazines and websites.
now orbit the sun, but the iron isotope signatures of Ryugu and other CI chondrites indicate that these bodies must have formed farther from the sun. The abundance of deuterium and nitrogen-15 isotopes in the Ryugu samples, which are what one would expect from an origin in the cold outer solar system.
However, a team led by Ryuji Okazaki, a planetary scientist at Kyushu University in Japan, has recognized some differences in the composition of Ryugu compared to CI chondrites. In particular, these researchers found that Ryugu contains higher abundances of some noble gases including helium, neon, argon, krypton and xenon, but a lower abundance of the isotope nitrogen-15 than CI chondrites.
An artist's impression of planets in a protoplanetary disk. The solar system formed out of such a disk, and planetesimals such as Ryugu would have formed within the disk quickly from a process called pebble accretion. Oort Cloud comets formed, before they were scattered into the Oort Cloud," Hopp told Space.com. The Oort Cloud is a realm of trillions of small, icy objects that extends up to at least a light-year from the sun."Therefore, one could speculate that some Oort Cloud comets might have a similar isotopic composition to Ryugu."
The objects now inhabiting the Oort Cloud were scattered outward by Uranus and Neptune; some bodies would have been ejected from the solar system altogether to become interstellar objects like
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