The known planets in the Gaia-4 and Gaia-5 systems mostly exclude the possibility of planets in the habitable zones of these stars; giant planets on eccentric orbits may disrupt other planets via a “wrecking ball” mechanism.

Modeling shows how Apophis’s response to a cloud encounter with Earth depends on the object’s particle size distribution, particle shapes, packing configurations, and interior structure.

Using a new method to detect and characterize random, rapid changes in the flux from gamma-ray pulsars, researchers found no evidence for changes above the 10% level, with certain cases ruling out changes above 1%.

A reanalysis of a stellar sample confirms that standard models of how stars spin down over time are sufficient for active stars, but weakened magnetic braking is needed to explain abrupt decreases in torque.

Analysis of a particular microlensing signal suggests that there’s no simple model of the event; instead, it requires microlensing parallax, lens orbital motion, and a magnified binary companion to the host, with xallarap.

Modeling of accretion onto black holes of varying spins suggests that all hot accretion flows will develop intermittent jets if allowed to evolve for long enough.