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.
David Vallés-Pérez et al 2021 ApJL 920 L2
New simulations challenge the idea that the sparse gas within cosmic voids — underdense regions of the cosmic web — is a pristine environment for studying galaxy formation and evolution.
Ariel N. Deutsch et al 2021 Planet. Sci. J. 2 213
Lunar craters with stable deposits of ice tend to be smoother than those without, but it might be subsurface ice rather than visible ice that reduces the ruggedness of some craters at the Moon’s poles.