GRB 211211A is a long-duration gamma-ray burst without an associated supernova; its cause is still unknown, and now researchers have shown that a white dwarf–neutron star merger is a possible source.

Comet 103P/Hartley 2’s brightness has been in decline since 1991, and researchers have inferred that the comet’s active fraction has decreased by an order of magnitude in that time.

Analysis of metallicity gradients out to a redshift of z = 9 suggests that galaxy growth proceeded “inside out” during cosmic dawn, then shifted to enhanced gas mixing during cosmic noon.

Using detailed spectra and photometry, researchers determine that LMCN 2009-05a is a moderately fast D-class nova, signaling the formation of dust during its outburst.

Researchers demonstrate that 3-minute slow waves could be used to probe isolated loops and determine the plasma beta — the balance between magnetic and thermal pressure — along these loops.

Though gamma rays have been detected from a subset of globular clusters, these clusters likely only account for about 2% of the diffuse galactic gamma-ray emission.