E. Altamura et al 2020 AJ 159 122

Two quasars have been serendipitously discovered just 76 kpc apart; they are confirmed to lie at the same redshift and appear to represent a small-separation physical quasar binary.

S. Abdollahi et al 2020 ApJS 247 33

The fourth Fermi Large Area Telescope catalog (4FGL) of gamma-ray sources, based on 8 years of Fermi data, is the deepest yet in the 50 MeV – 1 TeV energy range and contains 5,064 sources above 4σ significance.

Naor Movshovitz et al 2020 ApJ 891 109

Modeling based on Saturn’s measured gravity field are used to contrain the planet’s interior structure, finding signs of a core that’s lower in density and larger in radial extent than typically found by standard models.

V. Tilvi et al 2020 ApJL 891 L10

Overlapping bubbles of ionized intergalactic medium have been found surrounding a group of two or three galaxies that lie at a spectroscopically confirmed redshift of z = 7.7, just 680 million years after the Big Bang.

K. Decker French et al 2020 ApJ 891 93

Compared to early-type galaxies of similar stellar masses, tidal disruption event hosts appear to have higher central surface brightnesses and stellar mass surface densities on 30–100 pc scales.

M. M. Hedman et al 2020 AJ 159 129

Among Saturn’s small satellites, Aegaeon, Methone, and Pallene may be darkened by high-energy radiation, and Calypso and Helene may be brightened by enhanced dust fluxes.