Spannend, die Bausteine des Lebens scheinen in vielen Meteoriten vorzukommen, wie jetzt eine Untersuchung an Proben von #Bennu, #Ryugu und zwei auf der Erde gefundenen Meteoriten nachgewiesen wurde.
https://borncity.eu/senioren/2026/03/21/asteroid-ryugu-enthaelt-bausteine-des-lebens/
Significant Mission Milestones in OSIRIS-REx Journey to Bennu and Back ✨
#Asteroid #Astrophysics #AtmosphericComposition #Bennu #Biosphere #CarbonDioxide #EarthInformationCenter #EarthScience
⏩ 7 new pictures and 8 new videos from NASA (SVS) https://commons.wikimedia.org/wiki/Special:ListFiles?limit=85&user=OptimusPrimeBot&ilshowall=1&offset=20260121201514
Organic #molecules delivered from #extraterrestrial materials may have played a key role in supplying building blocks for #life on #Earth.
Now scientists report all five canonical #nucleobases—purines (#adenine and #guanine) and pyrimidines (#cytosine, #thymine and #uracil)—in samples returned from the C-type #asteroid (162173) #Ryugu.
Samples from Ryugu, #Bennu and #Orgueil, which have a similar mineralogy and elemental composition, show purine-to-pyrimidine ratios negatively correlating with #ammonia.
These observations indicate that the nucleobases in these samples may have formed via a shared pathway depending on the physicochemical environment of the respective parent bodies.
The detection of diverse nucleobases in asteroid and meteorite materials demonstrates their widespread presence throughout the Solar System and reinforces the hypothesis that carbonaceous asteroids contributed to the #prebiotic chemical inventory of early Earth.
#astronomy #astrobiology
https://www.nature.com/articles/s41550-026-02791-z
Samples returned from the asteroid Ryugu contain all five canonical nucleobases (A, G, C, T and U). Their presence in Ryugu and Bennu supports the hypothesis that carbonaceous asteroids contributed to the prebiotic chemical inventory of early Earth.
In one of the biggest surprises of NASA's OSIRIS-REx mission, its target asteroid, Bennu, turned out to be a jagged, rugged world covered in large boulders, with few of the smooth patches of sandy or pebbly material scientists had expected based on observations with Earth-based instruments. Bennu's looks were quite deceiving, and until now, scientists struggled to figure out why.
Thermal inertia is used to infer physical properties of asteroid surfaces. Here, authors propose that the low thermal inertia of asteroids Bennu and Ryugu is driven by cracks in rocks resulting from geological processes within the parent body – or more recently through micrometeorite impacts
Asteroid Bennu’s Rugged Surface Baffled NASA, We Finally Know Why
Solving Asteroid Bennu’s Mysteries
https://fed.brid.gy/r/https://www.nasa.gov/image-article/solving-asteroid-bennus-mysteries/
Günter Born
OptimusPrimeBot
Mikko Tuomi
Kuuke's Sterrenbeelden
NASA
Daniel Fischer
NASA
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