Abstract A stellar occultation occurs when a Solar System object passes in front of star for an observer. This technique allows the sizes and shapes occulting body to be determined with kilometer precision. In addition, this constrains body’s positions, albedos, densities, so on. context Galilean moons, these events can provide their best ground-based astrometry, uncertainties order 1 mas (∼3 k...

N-body simulations of structure formation with scale-invariant primordial perturbations show significantly more virialized objects of dwarf-galaxy mass in a typical galactic halo than are observed around the Milky Way. We show that the dearth of observed dwarf galaxies could be explained by a dramatic downturn in the power spectrum at small distance scales. This suppression of small-scale power...

Although the two moons of Mars, Phobos and Deimos, have long been thought to be captured asteroids, recent observations of their compositions and orbits suggest that they may have formed from debris generated by one or more giant impacts of bodies with $0.01Â target mass. Recent studies have both analytically estimated debris produced by giant impacts on Mars and numerically examined the evolut...

the reversed halo sign (rhs) may sometimes be seen in patients with cryptogenic organizing pneumonia (cop), but is rarely associated with other diseases. herein, we present a case of a 21-year-old woman with chronic eosinophilic pneumonia, with high resolution computed tomography (hrct) finding of rhs. this is an unusual and rare presentation of chronic eosinophilic pneumonia.

Abstract The 27 satellites of Uranus are enigmatic, with dark surfaces coated by material that could be rich in organics. Voyager 2 imaged the southern hemispheres Uranus’s five largest “classical” moons—Miranda, Ariel, Umbriel, Titania, and Oberon, as well ring moon, Puck—but their northern were largely unobservable at time flyby not imaged. Additionally, no spatially resolved data sets exist ...

The inner moons of Jupiter and Saturn migrate outwards due to tidal energy dissipation within the planets, the details of which remain poorly understood. We demonstrate that resonance locking between moons and internal oscillation modes of the planet can produce rapid tidal migration. Resonance locking arises due to the internal structural evolution of the planet and typically produces an outwa...

There is interest in the role of ammonia on Saturn's moons Titan and Enceladus as the presence of water, methane, and ammonia under temperature and pressure conditions of the surface and interior make these moons rich environments for the study of phases formed by these materials. Ammonia is known to form solid hemi-, mono-, and dihydrate crystal phases under conditions consistent with the surf...