During the formation of rocky planets, the surface environments of growing protoplanets were dramatically different from those of present-day planets.
imapct event
Posted inAtmospheres, Climate, Weather, Away Teams & Field Reports, Impact events, Meteorites & Asteroids, Planetary Protection & Biosafety, Sample Return, Status Report
Century-Scale Effect Of Climate Change On Meteorite Falls
Climate change is inducing a global atmospheric contraction above the tropopause (~10 km), leading to systematic decrease in neutral air density.
![The region in which dark matter impacts may leave detectable surface features on Ganymede. Gray regions correspond to existing constraints [33, 35, 37]. The light purple region is the region in which the dark matter has sufficient initial energy to penetrate through the 12 km conductive ice layer on Ganymede’s surface. The darker purple region corresponds to when the dark matter penetrates the entirety of Ganymede, leaving both an entrance and exit wound. Rough estimates for the approximate number of craters and crater radius from Eqs. 1 and 13 are provided on the top and right axes respectively, rounded to one significant figure for readability. -- astro-ph.EP](https://i0.wp.com/astrobiology.com/wp-content/uploads/2025/08/Dark-Wounds-On-Icy-Moons.png?resize=1200%2C720&ssl=1)
Posted inAstrogeology, Astronomy & Telescopes, Ganymede, Icy Worlds, Imaging & Spectroscopy, Impact events, Status Report
Dark Wounds On Icy Moons: Ganymede’s Subsurface Ocean As A Dark Matter Detector
Dark matter in the form of macroscopic composites is largely unconstrained at masses of ∼1011−1017 g. In this mass range, dark matter may collide with planetary bodies, depositing an immense […]
Posted inAstrogeology, Comets and Asteroids, Icy Worlds, Imaging & Spectroscopy, Impact events, Jupiter, Mapping, Geodesy, Cartography, Bathymetry, Meteorites & Asteroids, Saturn, Status Report, Uranus
The Current Cratering Rate on the Regular Satellites of Jupiter, Saturn, and Uranus
We aim to compute the impact rates for objects with a diameter of 1 km onto the regular satellites of Jupiter, Saturn and Uranus using our latest dynamical simulations of […]