Karoline M. Gilbert et al 2020 AJ 160 41

Tentative evidence suggests that the [α/Fe] abundances of stars in the Andromeda galaxy’s outer halo are more similar to the abundances of Milky Way halo stars than to the abundances of stars in Andromeda’s inner halo.

Daniel J. Whalen et al 2020 ApJL 897 L16

Cosmological simulations show that black holes born from the direct collapse of population III stars in cold accretion flows — which could grow to a billion solar masses by z ~ 7 — could be detectable by the James Webb Space Telescope.

Markus J. Aschwanden 2020 ApJ 897 16

Newly determined scaling relationships of flare properties are used to predict the upper limits of the Geostationary Orbiting Earth Satellite (GOES) fluxes of flares, improving space-weather forecasting.

Jordan K. Steckloff et al 2020 Planet. Sci. J. 1 26

Methane evaporation stratifies Titan’s lakes — which are made up of liquid methane, ethane, and nitrogen — into ethane-rich and methane-rich layers separated by a strong compositional gradient.

Klaus M. Pontoppidan et al 2020 ApJ 896 169

New near-infrared imaging of the great disk shadow in the Serpens star-forming region demonstrate strong variability of the disk shadow, revealing dynamics of the inner disk on timescales of months.

David Jewitt et al 2020 ApJL 896 L39

Hubble observations of interstellar comet 2I/Borisov reveal an outburst and splitting of the comet’s nucleus, likely ejecting one or more meter-sized boulders that nonetheless made up a small fraction of the comet’s mass.