[University of Cologne] Scientists have pinpointed the origin and composition of the asteroid that caused the mass extinction 66 million years ago, revealing it was a rare carbonaceous asteroid from […]
AAAS
Posted inBiochemistry & Organic Chemistry, Biophysics, Genomics, Proteomics, Bioinformatics, Microbiology & Virology, Origin & Evolution of Life, Press Release
The Nitroplast Revealed: A Nitrogen-fixing Organelle In A Marine Alga
A nitrogen-fixing bacterial endosymbiont of marine algae is evolving into a nitrogen-fixing organelle, or nitroplast, according to a new study, thereby expanding a function that was thought to be exclusively […]
Posted inAstrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Imaging & Spectroscopy, Io, Jupiter, Press Release
Atmospheric Isotopes Reveal 4.5 Billion Years Of Volcanism On Io
Sulfur and chlorine isotopes in the atmosphere of Jupiter’s moon Io indicate that it has been volcanically active for the entire 4.57 billion-year history of the Solar System, according to […]
Posted inAstrochemistry, Astrogeology, Biogeochemical Cycles & Geobiology, Comets and Asteroids, Gas Giants, Meteorites & Asteroids, Press Release
Dating The Solar System’s Giant Planet Migration Using Chondrite Meteorites
The period of orbital instability that led to the migration of the Solar System’s giant planets to their current orbit occurred between 60 and 100 million years after the beginning […]
Posted inBiogeochemical Cycles & Geobiology, Extinction events, Fossils & Paleontology, Press Release, Water/Hycean Worlds & Oceanography
Oxygen Increased In Earth’s Tropical Ocean During The Paleocene-Eocene Thermal Maximum
Oxygenation in the tropical North Pacific Ocean increased during a warm climatic interval that occurred roughly 56 million years ago, despite high global temperatures, according to a new study.
![All [C I] emission around 4C 41.17. (A) The blue and cyan [C I] contours are the same as Figure 1A; the green (marked as radio galaxy `RG’) and red (marked as South-East `SE’) contours show additional velocity channels. The background image is the same as Fig. S1A. The [C I] emission is integrated across the velocity ranges indicated in the legend. Blue and red contour levels start at 2σ and increase by 1σ, with σ = 0.011 Jy bm-1 × km s-1. The green contours start at 3σ and increase by 1σ, with σ = 0.015 Jy bm-1 × km s-1. No correction for primary beam (PB) response was applied. The gray contours show the Lyα halo (background image in Fig. 1A). Two red galaxies in the HST imaging at the base of the stream are probably dusty star-forming galaxies (DSFGs) (27), marked with arrows. The dotted gray lines indicate two prominent dark lanes (DL) previously identified in the Lyα imaging (17 ,24). Other symbols and labels are the same as Figure 1. (B-H) Spectra of [C I] extracted at the locations of the white crosses in panel A, which capture regions NW1, NW2, NW3, and NW4 of the stream, as well as the radio galaxy (RG), the region West of the radio galaxy that connects to the stream (W), and the region South-East of the radio galaxy (SE). The spectra are Hanning smoothed to a velocity resolution of 29 km s-1 and values have been corrected for the PB response to give flux densities. The colored shaded regions correspond to the velocity ranges in the legend. -- Science](https://i0.wp.com/astrobiology.com/wp-content/uploads/2023/04/Expansive.png?resize=1200%2C720&ssl=1)
Posted inAstrochemistry, Astronomy & Telescopes, Imaging & Spectroscopy, Press Release
Expansive Intergalactic Stream Of Cold Cosmic Carbon Feeding A Massive Galaxy
Radio telescope observations have revealed a cold stream of intergalactic atomic carbon gas feeding star formation in a massive radio galaxy in the young Universe.
Posted inAstrochemistry, Astrogeology, Meteorites & Asteroids, Press Release
Two Studies Of Volatile Elements Discovered In Meteorites Constrain The Assembly Of Earth
In two separate studies, researchers identify nucleosynthetic isotope anomalies in the volatile elements potassium (K) and zinc (Zn) in meteorites, which constrain the origins of the material that formed Earth.
Posted inAstrogeology, Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Habitable Zones, Press Release
Earth’s Geological Thermostat: How Temperature-dependent Silicate Weathering Helps Steer The Planet’s Climate
The process of minerals in rocks being chemically broken down, or weathered – which plays a crucial role in controlling Earth’s climate – removes less carbon dioxide (CO2) if temperatures […]
Posted inAstrochemistry, Press Release
Benzonitrile Detected In Space
Scientists studying a cold molecular cloud of the Taurus region with radio telescopes have detected the presence of a particular organic molecule called benzonitrile. The finding marks the first time […]