Extraterrestrial civilizations may synchronize their signals with a major cosmic event, like the supernova SN 1987A; a recent search found no anomalous signals from likely targets.

More than half of the Milky Way gamma-ray sources in a recent catalog are unidentified; new X-ray observations reveal that many of the unidentified sources are pulsars.

Leveraging data taken over years or decades, researchers have confirmed the planetary nature of several giant exoplanets with orbits longer than 100 days; other planets surveyed turned out not to be planets at all.

Using JWST observations of just a single planetary transit and two secondary eclipses, researchers have demonstrated a new technique to determine accurate parameters for low-mass stars.

Recent measurements show that the 20-year-long decay of the cyclotron line energy of Her X-1 — an X-ray binary pulsar system — has stopped, and the cyclotron line energy is now stable.

In September 2022, the Juno spacecraft made the first close pass of Europa since 2000; no major surface changes were detected, but the new images allowed researchers to study true polar wander.