Mid-infrared emission owing to an unexpectedly high temperature could be due to an active surface region or a ring system made up of small grains; either possibility would be unprecedented.

Light curves and spectra of more than 40,000 stars reveal an increase in magnetic activity toward later spectral types and with proximity to the galactic plane, as well as other findings related to flares and starspots.

Spectral mixture analysis suggests 11 new sites where organic compounds may be located on Ceres; the distribution of these sites suggests that these materials are native to Ceres rather than delivered by impacts.

The combined powers of two neutrino detectors could give early warning of the impending explosion of a 15-solar-mass star at 1,670 light-years, with a false alarm rate of one per century.

Modeling shows that coronae — the tenuous plasma structures associated with accreting compact objects — have the potential to contribute a significant number of the galaxy’s cosmic rays.

Simulations show that lava planets with and without clouds have discernibly different spectra, but the ability to discern this difference may be beyond the limits of current instruments.