![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)
[astro-ph.EP] Massive moons around rocky exoplanets are expected outcomes of giant impacts, yet no exomoon has been securely confirmed.
Impact events
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 […]
Posted inMars
Perseverance Rover Provides A Record of Ancient Mars Impacts
[NASA] Old rocks exposed on the rim of Jezero Crater preserve a roughly 4-billion-year-old cosmic “weather report” from the solar system’s most dynamic era.
![Averages over 100 trials of Siberian Traps injection scenario on a 31× 31 grid in the (fp, θ) parameter space. Mean number of DIC peaks (left), mean maximum DIC jump (top right), and mean time to return to equilibrium after end of injection phases (bottom right) are shown. The letters in the left panel correspond to parameters used in the example trials shown in Figure 10. -- [physics.ao-ph]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/Modeling-the-response.png?resize=1200%2C720&ssl=1)
Posted inAtmospheres, Climate, Weather
Modeling The Response Of Earth’s Marine Carbon Cycle To Extreme CO2 Injection Events
[physics.ao-ph] We explore how the response of a conceptual model of the marine carbon cycle depends on the way in which carbon is injected from the atmosphere.
![The New jersey meteorite -- [SETI Institute]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/07/ALien-World.png?resize=1200%2C900&ssl=1)
Posted inAstrochemistry
Alien World Chemistry Found Inside A Meteorite that Struck A New Jersey Home
[SETI Institute] On July 16, 2024 a daytime meteor shook New York City with a sonic boom as it passed just south of the Statue of Liberty. Now, an international […]
Posted inMars
Frosty Dunes Of An Impact Crater On Mars
[NASA] This observation is one of three images requested from HiRISE at this location to monitor frost deposition, evolution and sublimation.
Posted inImpact events
Asteroid Assault Made Ancient Earth Too Hot And Chaotic For Continents To Form
[Curtin University] New research led by Curtin University and QUT (Queensland University of Technology) has revealed repeated asteroid impacts may have been the dominant force shaping the early Earth, delivering […]