Astrochemistry

Efficient Formation Pathway Of Methyl Formate: The Role Of OH Radicals On Ice Dust

Efficient Formation Pathway Of Methyl Formate: The Role Of OH Radicals On Ice Dust

Three structural isomers of the C2H4O2 molecule, namely, methyl formate (MF; HCOOCH3), acetic acid (AA; CH3COOH), and glycol aldehyde (GA; HOCH2CHO), have attracted considerable attention as targets for understanding pathways towards molecular complexity in the interstellar medium (ISM).

Geobiology

Retention Of Water In Terrestrial Magma Oceans And Carbon-rich Early Atmospheres

Retention Of Water In Terrestrial Magma Oceans And Carbon-rich Early Atmospheres

Massive steam and CO2 atmospheres have been proposed for magma ocean outgassing of Earth and terrestrial planets.

Astrochemistry

Discovery Of Two Isomers Of Ethynyl Cyclopentadiene In TMC-1: Abundances of CCH And CN Derivatives Of Hydrocarbon Cycles

Discovery Of Two Isomers Of Ethynyl Cyclopentadiene In TMC-1: Abundances of CCH And CN Derivatives Of Hydrocarbon Cycles

We report the detection of two isomers of ethynyl cyclopentadiene (c-C5H5CCH), namely 1- and 2-ethynyl-1,3-cyclopentadiene, in the direction of TMC-1.

Titan

ASTrAEUS: An Aerial-Aquatic Titan Mission Profile

ASTrAEUS: An Aerial-Aquatic Titan Mission Profile

Key questions surrounding the origin and evolution of Titan and the Saturnian system in which it resides remain following the Cassini-Huygens mission.

Astrochemistry

Formation Of Complex Organic Molecules In Hot Molecular Cores Through Nondiffusive Grain-surface And ice-mantle Chemistry

Formation Of Complex Organic Molecules In Hot Molecular Cores Through Nondiffusive Grain-surface And ice-mantle Chemistry

A new, more comprehensive model of gas-grain chemistry in hot molecular cores is presented, in which nondiffusive reaction processes on dust-grain surfaces and in ice mantles are implemented alongside traditional diffusive surface/bulk-ice chemistry.

Ceres

Traces of Ceres' Icy Crust Found at Occator Crater

Traces of Ceres' Icy Crust Found at Occator Crater

Anomalies in the distribution of hydrogen at Occator crater on the dwarf planet Ceres reveal an icy crust, says a new paper led by Tom Prettyman, a Senior Scientist at the Planetary Science Institute.

Titan

Titan's River Maps May Advise Dragonfly's Sedimental Journey

Titan's River Maps May Advise Dragonfly's Sedimental Journey

With future space exploration in mind, a Cornell-led team of astronomers has published the final maps of Titan's liquid methane rivers and tributaries - as seen by NASA's late Cassini mission - so that may help provide context for Dragonfly's upcoming 2030s expedition.

Astrobiology (general)

The Fine-Tuning of the Universe for Life

The Fine-Tuning of the Universe for Life

When a physicist says that a theory is fine-tuned, they mean that it must make a suspiciously precise assumption in order to explain a certain observation.

Astrochemistry

Chirality in Astrophysics

Chirality in Astrophysics

Chirality, or handedness, enters astrophysics in three distinct ways. Magnetic field and vortex lines tend to be helical and have a systematic twist in the northern and southern hemispheres of a star or a galaxy.

Venus

Day-night Cloud Asymmetry Prevents Early Oceans On Venus But Not On Earth

Day-night Cloud Asymmetry Prevents Early Oceans On Venus But Not On Earth

Earth has had oceans for nearly four billion years and Mars had lakes and rivers 3.5-3.8 billion years ago. However, it is still unknown whether water has ever condensed on the surface of Venus because the planet - now completely dry - has undergone global resurfacing events that obscure most of its history.

Astrobiology (general)

Letter to the Astrobiology Community: Strengthening Inclusion, Diversity, Equity, & Accessibility

Letter to the Astrobiology Community: Strengthening Inclusion, Diversity, Equity, & Accessibility

Dear Astrobiology Community: We at NASA Astrobiology are continuing to prioritize thoughts and efforts in justice, equity, and belonging. We are seeking your inputs at this time on several fronts toward building momentum for growth, change, and action... for ourselves and our beloved community.

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