A reanalysis of the radial-velocity data for the star Gliese 229 suggests that the previously reported signals from three exoplanets in orbit around the star are actually due to stellar activity.
Monte Carlo simulations show that the polarization degree and angle of X-ray photons can be determined under a range of conditions by a proposed detector bound for the Tiangong space station.
Theodore Kareta et al 2025 ApJL 979 L8
Spectroscopy reveals that the makeup of Earth’s “mini-Moon” asteroid is similar to that of the Moon rather than other asteroids, likely making this the second near-Earth asteroid through to originate from the Moon.
Haipeng An et al 2024 ApJ 976 247
Astrometric measurements may offer a way to detect the subtle influence of gravitational waves and theoretical effects like those from ultra-light dark photon dark matter.
S. R. Callos et al 2025 Planet. Sci. J. 6 17
Particle clouds called spokes in the outer parts of Saturn’s rings show a variety of intriguing behaviors, including seasonal variations and switching from appearing darker and lighter than the ring material.
Twenty years of observations show a consistently hot temperature for the plasma surrounding HL Tau, similar to what is seen for other protostars in the same evolutionary stage.