ZTF19acnskyy may be the first X-ray quasiperiodic eruption source to display correlated ultraviolet emission — another strange behavior that researchers must explain for this already unique source.

Simulations suggest that tidally locked planets have similar atmospheric escape rates to Earth analogs despite having cooler and drier atmospheres near their surfaces.

Using the Five-hundred-meter Aperture Spherical radio Telescope, researchers have discovered and measured the spins and masses of a pair of neutron stars using the pulsar timing method.

A survey of six gas giants orbiting F-type stars suggests that atmospheric escape of these planets is determined by the X-ray and extreme-ultraviolet output of their host stars as well as the Roche filling factor.

Using simulations of 20 asteroids from 0.05 to 2.4 au away, researchers demonstrate how the technique of topocentric parallax could be used to determine the distance to an asteroid in a single night.

Simulations suggest that Rubin Observatory will discover 1–2 meter-size or larger imminent impactors each year, nearly doubling the discovery rate and providing an important set of eyes in the Southern Hemisphere.

Researchers have found a rare example of a blue straggler star in the process of formation, providing direct evidence for the formation of these puzzling stars through ongoing mass transfer in a binary system.

In a sample of 171 new dual active galactic nuclei, four triplets, and one quadruplet drawn from a catalog of nearly a million quasars, researchers find that roughly 16% of targets exhibit tidal features.

Researchers find a system inclination of 41.8 degrees for WR 104; this result is at odds with previous interpretations of the system’s dust plume, but a new geometric model reconciles these results.

The observed steepening of the cosmic-ray spectrum at ~4 PeV could be a global or local feature; a local feature could be explained by sources located ~1 kpc away with ages of 0.1–1 million years.

Using three dedicated telescopes and two spacecraft in the Earth–Moon environment, researchers demonstrate the abilities of an image stacking method to detect space debris.

Analysis of 10 nights of observations of Europa’s auroral emission suggests that optical auroral brightness may be a proxy for electron density variations, assuming a stable atmospheric composition and density.

Magnetothermal modeling suggests that neutron stars may remain “silent” at radio frequencies for approximately 100,000 years before activating, potentially as long-period radio transients.

A newly discovered massive giant planet likely has a retrograde orbit relative to the other known planet in the system, pointing to a potentially violent dynamical history.

The galactic center star IRS 9 is locally unbound and was likely placed on its current trajectory by binary supernova disruption, two-body interactions, or stellar collisions.

Chromospheric and photospheric activity in M dwarfs appear to be correlated, with stellar rotation influencing both types of activity and metallicity impacting the intensity of chromospheric activity.

By cross-matching results from two different search algorithms, researchers have discovered three new Milky Way satellites, two of which appear to be dwarf galaxies and one of which is likely a star cluster.

New observations of a young star cluster challenge the view that lithium depletion only occurs after 150 million years; the team also uncovered a correlation between stellar rotation rate and lithium depletion.

Combining data from Mariner 10 and MESSENGER, researchers find that space weathering processes mix graphite into the surface material in Mercury, which potentially alters the material’s phase.

Researchers analyze localization tools that may be used to pinpoint the sources of short gamma-ray bursts in light curves from the Anticoincidence Subsystem on the Compton Spectrometer and Imager (COSI).