JWST observations of GRB 221009A reveal the associated supernova, confirming that the GRB resulted from the collapse of a rapidly rotating massive star. The lack of r-process emission suggests that these extreme events are not key sources of the heaviest elements.

A three-dimensional reconstruction of a bright flare orbiting the black hole Sagittarius A^* is computationally recovered from ALMA light curve data by constraining a neural network with a gravitational model of black holes.

The observed ‘radius valley’ — a dip in the distribution of exoplanet radii, which separates rocky super-Earths from larger sub-Neptunes — is at odds with current theories of planetary formation. New simulations that couple planet formation and evolution, and account for the orbital migration of planets that are largely composed of steam, are able to reproduce the valley feature.

In situ observations reveal explosive mass ejections due to magnetic reconnection in the ionosphere of Mars, with a density cavity as direct evidence. Reconnection between strong open crustal fields can rapidly eject a large amount of mass from Mars.

A three-dimensional reconstruction of a bright flare orbiting the black hole Sagittarius A^* is computationally recovered from ALMA light curve data by constraining a neural network with a gravitational model of black holes.

Simulated close encounters between planetary systems and other stars reveal that outer giant planets on wide orbits tend to be ejected, with a fraction of them forming bound pairs. This scenario would lead to a population of free-floating binary planets in dense stellar environments

The Earth co-orbital asteroid Kamo‘oalewa, which is a target of the Chinese Tianwen-2 mission, may have a lunar origin instead of an asteroidal one. Dynamical constraints from numerical simulations suggest that it could be an escaping fragment from the lunar Giordano Bruno crater.

As the eighth anniversary of Nature Astronomy’s opening to submissions nears, we say goodbye to our inaugural Chief Editor, May Chiao, and welcome her successor, Paul Woods, to the helm.