Qiang Wei et al 2018 ApJL 856 L14

Numerical simulations demonstrate that craters can be removed by viscous relaxation of nitrogen ice in Sputnik Planitia on relatively short timescales — thus explaining the young surface observed here by New Horizon.

Shiho Tsujimoto et al 2018 ApJ 856 91

Five expanding shells have been detected in the l = -1.2° region of the galactic center, indicating the region may be a molecular bubble associated with an embedded massive star cluster.

A. Drlica-Wagner et al 2018 ApJS 235 33

The Dark Energy Survey internal year-one cosmology data set, Y1A1 GOLD, is the largest photometric data set at its depth to date, enabling precise measurements of cosmic acceleration at z <~ 1.

Dan P. Clemens et al 2018 ApJL 856 L8

Further observations of a faint star located 2 arcsec from KIC 8462852 show that the two stars cannot be bound, thus refuting the suggestion that the variability of Boyajian’s star is explained by a binary system.

I. Oteo et al 2018 ApJ 856 72

10 dusty star-forming galaxies are found in the core of an extreme protocluster of galaxies in the early universe. Their star formation rate is considerably higher than those seen before in any z > 4 protocluster.

Eric L. Sandquist et al 2018 AJ 155 152

K2 observations of a main-sequence binary system in the old open cluster M67 suggest that this was once a primordial triple system. Two of the stars in the system merged ~1 Gyr ago, producing the unusual binary.