A. M. Meisner et al 2018 AJ 155 166

The deepest and widest-area WISE search for Planet Nine to date — covering more than 75% of the sky and incorporating 4 years of WISE observations spanning a 7-year period — found no indication of Planet Nine.

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.