W. Cerny et al 2021 ApJ 910 18
A new ultra-faint stellar system has been found near the Magellanic Clouds; it cannot be conclusively classified at present, but it may be among the oldest and most metal-poor globular clusters in the Magellanic system.
Ryan Magee et al 2021 ApJL 910 L21
New low-latency infrastructure has been commissioned and implemented by LIGO-Virgo to provide early warning for binary neutron star mergers and alert partner facilities before the mergers occur.
Sarah E. Anderson et al 2021 Planet. Sci. J. 2 50
New simulations of the late-stage circumplanetary disk that surrounded Saturn during its formation use the compositions of Enceladus and Titan to place constraints on their formation environment within the disk.
Jiansen He et al 2021 ApJ 910 7
The Parker Solar Probe can be used to explore small bodies it passes, like the comet-like object 322P/SOHO, which swept by the probe on 2019 September 2 at a relative distance as close as 0.025 au.
Konstantin Batygin and Michael E. Brown 2021 ApJL 910 L20
New modeling of the impact of a hypothetical Planet Nine on solar system bodies suggests that observed long-period trans-Neptunian objects could include a mixture of Oort cloud and Kuiper Belt objects.
Yuxi (Lucy) Lu et al 2021 AJ 161 189
From rotation and kinematic properties, the ages of 29,949 Kepler F, G, K, and M dwarfs are estimated, providing insight into the evolution of low-mass stars on the main sequence.