Improved statistical modeling suggests that the creation of Mars’s alluvial fans — triangular deposits of sediment and debris — potentially proceeded until ~2.5 billion years ago, well into the Amazonian Period.
High-resolution simulations suggest that the act of capturing a satellite galaxy on an eccentric orbit can substantially alter the dark-matter profile of a galaxy, causing it to transition from “cusp-like” to “core-like.”
During the hour-long post-flare phase, loops of plasma suspended in the Sun’s magnetic field rain cool, dense plasma — so-called coronal rain — from the hot corona into the cooler chromosphere below.
Daria Pidhorodetska et al 2021 AJ 162 169
Simulated spectroscopy of three M-dwarf planets — each with a radius less than 1.6 Earth radii — suggests that water, methane, and oxygen should be detectable with current and upcoming space telescopes.
Yun-Ting Cheng et al 2021 ApJ 919 69
Stacked infrared observations of 30,000 galaxies from the Sloan Digital Sky Survey reveal that intra-halo light is an important contributor to the observed extragalactic background light at near-infrared wavelengths.
Toby Brown et al 2021 ApJS 257 21
A survey has generated maps of 51 galaxies in the Virgo Cluster — a collection of more than 1,000 galaxies located some 53 million light-years distant — and provides new data for the study of molecular gas in galaxy clusters.