Results 111 to 120 of about 21,167 (278)
Boulders on Bennu: Low Apparent Thermal Inertia Caused by Thermal Fatigue Fractures
Geophysical Research Letters, Volume 52, Issue 21, 16 November 2025.Abstract Boulders covering the surfaces of asteroids Bennu and Ryugu have apparent thermal inertias substantially lower than their meteorite analogs. This has led to the inference that boulders on Bennu may be unlike any known meteorite. However, samples returned from Ryugu have a thermal inertia 3.5 times higher than the apparent thermal inertia ...
Catherine M. Elder
wiley +1 more source
TWO BEYOND-PRIMITIVE EXTRASOLAR PLANETESIMALS [PDF]
The Astrophysical Journal, 2013 Using the Cosmic Origins Spectrograph onboard the Hubble Space Telescope, we have obtained high-resolution ultraviolet observations of GD 362 and PG 1225-079, two helium-dominated, externally-polluted white dwarfs. We determined or placed useful upper limits on the abundances of two key volatile elements, carbon and sulfur, in both stars; we also ...
Xu, S. +4 more
openaire +2 more sources
Science Advances, 2017 Both amino acids and macromolecular organic solids can be synthesized from simple molecules in small solar system bodies. The exogenous delivery of organic molecules could have played an important role in the emergence of life on the early Earth ...
Y. Kebukawa +4 more
semanticscholar +1 more source
X-ray photoevaporation's limited success in the formation of planetesimals by the streaming instability [PDF]
, 2017 The streaming instability is often invoked as solution to the fragmentation and drift barriers in planetesimal formation, catalysing the aggregation of dust on kyr time-scales to grow km-sized cores.
B. Ercolano +6 more
semanticscholar +1 more source
Shock-generating Planetesimals Perturbed by a Giant Planet in a Gas Disk [PDF]
Astrophysical Journal, 2018 We examined the excitations of planetesimals caused by the resonances of a giant planet in a protoplanetary gas disk. The highly excited planetesimals generate bow shocks, the mechanism of which results in chondrule formation, crystallization of silicate
M. Nagasawa +5 more
semanticscholar +1 more source
The Planetary Science JournalKuiper Belt objects (KBOs) show an unexpected trend, whereby large bodies have increasingly higher densities, up to five times greater than their smaller counterparts. Current explanations for this trend assume formation at constant composition, with the
Manuel H. Cañas +8 more
doaj +1 more source
The Astrophysical Journal, 2023 Using self-consistent models of turbulent particle growth in an evolving protoplanetary nebula of solar composition, we find that recently proposed local metallicity and Stokes number criteria necessary for the streaming instability to generate ...
Paul R. Estrada, Orkan M. Umurhan
doaj +1 more source
Terrestrial Planet Formation I. The Transition from Oligarchic Growth to Chaotic Growth
, 2005 We use a hybrid, multiannulus, n-body-coagulation code to investigate the growth of km-sized planetesimals at 0.4-2 AU around a solar-type star. After a short runaway growth phase, protoplanets with masses of roughly 10^26 g and larger form throughout ...
Benjamin C. Bromley +2 more
core +3 more sources
Felsic Magmatism on Venus Generated by Crustal Recycling and Melting
Journal of Geophysical Research: Planets, Volume 130, Issue 11, November 2025.Abstract The observation of low viscosity lava flows and shield volcanoes on radar images, combined with X‐ray fluorescence analyses performed by Soviet landers, strongly suggests that Venus's crust is primarily basaltic. However, near‐infrared emissivity data from the Galileo and Venus Express missions indicate that crustal plateaus may be ...
Max Collinet +4 more
wiley +1 more source
Planetesimal Disk Evolution Driven by Embryo-Planetesimal Gravitational Scattering
The Astronomical Journal, 2003 40 pages, 9 figures, submitted to ...
openaire +2 more sources