[Nature Astronomy] Among icy moons of the outer Solar System, subsurface water oceans and large collisions both seem to be common, but the impact of the latter on the presence […]
Impact events
Posted inMars
A Mars Impact Crater Surrounded By Chunks Of Water Ice
[NASA] Boulder-size blocks of water ice can be seen around the rim of this giant meteoroid impact crater on Mars, as viewed by the High-Resolution Imaging Science Experiment (HiRISE camera) […]
Posted inMars
An Interesting Crater In Valles Marineris
[ESA] Along the equator of Mars, CaSSIS spotted a couple of interesting craters in Ganges Chasma, a mineralogically diverse canyon in the far-eastern portion of Valles Marineris.
Posted inMars
Subsurface Sediment Mobilization On Mars
[NASA/JPL/UA] This image covers a pie-like feature that thought to be the result of subsurface sediment mobilization.
![Inclination vs. semimajor axis for the NEOs. The main asteroid families that have been linked to ordinary chondrites are represented by gray squares. The ν6 secular resonance with Saturn and the 3:1 and 5:2 mean motion resonances with Jupiter are represented with dashed lines. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/Size-Constraints.png?resize=1200%2C718&ssl=1)
Posted inAstrogeology
Size Constraints For The Pre-atmospheric Parent Bodies Of Ordinary Chondrites
[astro-ph.EP] The study of S-complex near-Earth objects (NEOs), the parent bodies of ordinary chondrites, has shown that they are dominated by asteroids with LL chondrite-like compositions. This is surprising because […]
![Evolution of impact-generated debris for the high-velocity impact cases. Rows correspond to different impact scenarios with varying orbital periods (Porb) and impact velocities (vimp), as labeled. Columns show snapshots at 0.35, 2.65, 14.69, and 18.05 hr after impact. Particles are shown in a midplane slice with |z| < 0.1 R⊕, and colors indicate material origin and composition. In the 2.65 and 14.69 hr snapshots, particles are additionally highlighted according to their final fate, identifying those incorporated into the disk and those that later escaped from the system.-- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/A-Formation.png?resize=1200%2C716&ssl=1)
Posted inExoplanets, -moons, -comets
A Formation-Stage Bottleneck For Exomoons Around Close-in Rocky Planets
[astro-ph.EP] Massive moons around rocky exoplanets are expected outcomes of giant impacts, yet no exomoon has been securely confirmed.
Posted inExtinction events
Dinosaur-killing Asteroid Also Created A Dust Cloud That Insulated Earth, Charbroiling Cretaceous Creatures
[Purdue University] Sixty-six million years ago, an asteroid about the size of Mount Everest smacked into Earth near where the Yucatan Peninsula is today. That impact created the Chicxulub crater […]
Posted inExoplanets, -moons, -comets
Dynamically Selected Mass-Radius Relationship For Low Mass Exoplanets
[astro-ph.EP] We study the mass-radius relationship of planets in multiplanet systems as a function of their dynamical architecture.
![Vertical component spectrogram of event S1094b, caused by a meteoritic impact (Posiolova et al., 2022). The bottom two panels show P- and S-wave spectra in several 60 second time windows following the direct arrival. The spectral shape stays consistent throughout the inital 150 and 230 seconds after arrival of the phase, indicating an equipartitioning of seismic energy with no significant viscoelastic attenuation. -- [astro-ph.IM]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Discrimination-of.png?resize=1200%2C719&ssl=1)
Posted inMars
Discrimination of Tectonic, Swarm And Impact-related Marsquakes Using Spectral Characteristics
[astro-ph.IM] The NASA InSight mission observed over 2000 marsquakes in the course of its three year mission. These quakes varied in magnitude between 1.5 and 4.5, as well as in […]
Posted inImpact events
Researchers Identify Class Of Oddball Meteorite That Killed Earth’s Dinosaurs
[University of British Columbia] A rare CO chondrite meteorite was the probable impactor that struck Earth 66 million years ago, wiping out 75 per cent of Earth’s species, including non-avian […]