Several billion years ago, the oceans were probably not as hot as often assumed, but were instead at much more moderate temperatures.
astrogeology
Posted inAstrogeology, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Press Release
A Catalog Of Earth’s Minerals Will Inform Models Of Life’s History And Extraterrestrial life
A 15-year study led by the Carnegie Institution for Science details the origins and diversity of every known mineral on Earth, a landmark body of work that will help reconstruct […]
Posted inAstrochemistry, Astrogeology, Meteorites & Asteroids, Press Release
Meteorite Petrology Versus Genetics: Toward A Unified Binominal Classification
The current meteorite taxonomy, a result of two centuries of meteorite research and tradition, entangles textural and genetic terms in a less than consistent fashion, with some taxa (like shergottites) […]
Posted inAstrochemistry, Astrogeology, Exoplanets, -moons, -comets, Press Release
The Molecular Composition Of Shadowed Protosolar Disk Midplanes Beyond The Water Snowline
Image: Pie charts of the percentage contributions of the dominant carbon-bearing molecules to the total elemental carbon abundance (= 1.4 × 10−4 , top panels), the dominant oxygen-bearing molecules to […]
Posted inAstrogeology
Planet Formation Theory In The Era Of ALMA And Kepler: From Pebbles To Exoplanets
Our understanding of planet formation has been rapidly evolving in recent years. The classical planet formation theory, developed when the only known planetary system was our own Solar System, has […]
Posted inAstrogeology
Internal Structure and Magnetic Moment of Rocky Planets. Application To The First Exoplanets Discovered By TESS
For a planet to be considered habitable on its surface, it is an important advantage for it to have a magnetic field that protects its atmosphere from stellar winds as […]
Posted inAstrogeology
The Metal-Silicate Partitioning Of Carbon During Earth's Accretion And Its Distribution In The Early Solar System
Carbon is an essential element for the existence and evolution of life on Earth. Its abundance in Earth’s crust and mantle (the Bulk Silicate Earth, BSE) is surprisingly high given […]
Posted inExoplanets, -moons, -comets
Polluted White Dwarfs Reveal Exotic Mantle Rock Types on Exoplanets in our Solar Neighborhood
Prior studies have hypothesized that some polluted white dwarfs record continent-like granitic crust–which is abundant on Earth and perhaps uniquely indicative of plate tectonics. But these inferences derive from only […]
Posted inAstrochemistry, Astronomy & Telescopes, Comets and Asteroids, Icy Worlds, Imaging & Spectroscopy, Interstellar, SETI & Technosignatures
On The Possibility Of An Artificial Origin For `Oumuamua
Science offers the privilege of following evidence, not prejudice. The first interstellar object discovered near Earth, Oumuamua, showed half a dozen anomalies relative to comets or asteroids in the Solar […]
Posted inAstrogeology
The Earth Has A Pulse
Geologic activity on Earth appears to follow a 27.5-million-year cycle, giving the planet a “pulse,” according to a new study published in the journal Geoscience Frontiers. “Many geologists believe that […]