Hiromichi Tagawa et al 2020 ApJ 892 36
Models show that when collapsing gas fragments at higher densities, the central protostar avoids contraction and keeps growing via frequent stellar mergers, reaching masses as high as ~105–106 M⊙.
Marina Brozović et al 2020 AJ 159 149
Ranging measurements from Arecibo observations spanning 1999 to 2016 provide high precision astrometric measurements of Jupiter’s moons Io, Europa, Ganymede, and Callisto.
Ryota Nakano and Masatoshi Hirabayashi 2020 ApJL 892 L22
Asteroid (3200) Phaethon, a source of the Geminid meteor stream, is rotating close to or above its critical rotation period; the Geminids may be the result of a past mass-shedding event from when it spun even faster.
Nahum Arav et al 2020 ApJS 247 37
The Hubble Space Telescope/Cosmic Origins Spectrograph has observed high-quality far-ultraviolet spectra of quasar outflows, obtaining measurements that include the three most energetic outflows known.
Zhi-Song Zhang et al 2020 ApJ 891 174
The first Search for Extraterrestrial Intelligence (SETI) observations have been conducted with China’s Five-hundred-meter Aperture Spherical radio Telescope (FAST), validating instrumentation techniques.
Marc W. Buie et al 2020 AJ 159 130
Four stellar occultations by (486958) Arrokoth, the flyby target of the New Horizons extended mission, more precisely constrain its shape and position and find no presence of rings or other debris around it.