Eos Archives

Callisto’s crater-covered surface may be hiding a liquid water ocean. Credit: NASA/JPL-Caltech/Kevin M. Gill, CC BY 2.0 Source: AGU Advances

Astrogeology, Biosignatures & Paleobiology, Callisto, Icy Worlds, Jupiter, Press Release, Water/Hycean Worlds & Oceanography

Callisto Is Very Likely an Ocean World

by Keith CowingFebruary 21, 2025February 21, 2025

More pocked with craters than any other object in our solar system, Jupiter’s outermost and second-biggest Galilean moon, Callisto, appears geologically unremarkable. In the 1990s, however, NASA’s Galileo spacecraft captured […]

Observed SFDs of C-type asteroid families. The SFDs usually exhibit a steep slope q1 at sizes D ≳ 5 km and a shallow slope q2 at D ≲ 5 km. This break is often created in the course of collisonal evolution. An observational bias affects the SFDs at even smaller sizes (0.5-3 km), depending on the distance and albedo of the respective populations. Additionally, families of P, B and M types were studied (together with 4 of unknown taxonomical classification). -- astro-ph.EP

Astrochemistry, Astrogeology, Comets and Asteroids, Impact events, Meteorites & Asteroids, Status Report

Source Regions of Carbonaceous Meteorites and NEOs

by Keith CowingJuly 3, 2024July 1, 2024

The present work aims to determine the source regions of carbonaceous chondrites (CM, CI, CO, CV, CK, CR, CH, CB, or C-ungrouped). We studied 38 individual asteroid families, including young […]