Brynna G. Downey

Abstract The Cassini mission provided unprecedented insights into Saturn’s largest moon, Titan, from its atmosphere to the deep interior1. The moon’s large measured response to the tides exerted by Saturn was interpreted as evidence of the existence of a subsurface ocean2,3. This response, twice the value predicted in pre-Cassini studies, has escaped complete explanation. Here we show that the signature of tidal dissipation in Titan’s gravity field is not consistent with the presence of an ocean.

Abstract Most edible fish species have been fished for centuries or millennia, leaving little record or understanding of their population responses prior to human impact and thus no baseline for population conservation. Here, we reconstruct the population dynamics of Atlantic cod, one of the world’s most harvested fish species, from the pristine state during the Viking era through more than 1100 years of fishing.

Abstract Tunable scattering resonances are crucial for controlling atomic and molecular systems. However, their use has so far been limited to ultracold temperatures. These conditions remain hard to achieve for most hybrid trapped ion-atom systems—a prospective platform for quantum technologies and fundamental research. Here, we measure inelastic collision probabilities for Sr+ + Rb and use them to calibrate a comprehensive theoretical model of ion-atom collisions.