pebbles Archives

Bright white float rocks on the Jezero crater rim Mars Perseverance Sol 1311: Left Mastcam-Z Camera Nov 12, 2024 NASA/JPL-Caltech Larger image

Astrogeology, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Caves, Craters, Mountains, Subsurface, Lava Tubes, Fossils & Paleontology, Imaging & Spectroscopy, Mars, Press Release, Robotics/Rovers/UAVs

Perseverance Observes Unusual White Float Rocks On Mars

by Keith CowingNovember 15, 2024November 15, 2024

During its recent exploration of the crater rim, Perseverance diverted to explore a strange, scattered field of bright white rocks which sparked the interest of the team scientists.

Evolution of the azimuthally averaged radial distributions of gas and dust parameters. The panels show (a) surface density of gas, (b) grown dust (including pebbles), (c) small dust, (d) maximum dust size, (e) dust-to-gas mass ratio, (f) surface density of pebbles, (g) maximum dust size relative to the fragmentation barrier, (h) Stokes number, (i) minimum pebble size. The solid blue line in panels (a) and (g) indicates the approximate disc boundary at Σg = 1g cm−2 , the dashed cyan line in panels (c)–(f), (h), and (i) shows the position of the water snowline. -- astro-ph.EP

Astrochemistry, Astrogeology, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Status Report

Ices On Pebbles In Protoplanetary Discs

by Keith CowingMarch 6, 2024March 6, 2024

The formation of solid macroscopic grains (pebbles) in protoplanetary discs is the first step toward planet formation. We aim to study the distribution of pebbles and the chemical composition of […]