Catálogo de publicaciones - revistas

<jats:title>Cassini's final phase of exploration</jats:title> <jats:p> The Cassini spacecraft spent 13 years orbiting Saturn; as it ran low on fuel, the trajectory was changed to sample regions it had not yet visited. A series of orbits close to the rings was followed by a Grand Finale orbit, which took the spacecraft through the gap between Saturn and its rings before the spacecraft was destroyed when it entered the planet's upper atmosphere. Six papers in this issue report results from these final phases of the Cassini mission. Dougherty <jats:italic>et al.</jats:italic> measured the magnetic field close to Saturn, which implies a complex multilayer dynamo process inside the planet. Roussos <jats:italic>et al.</jats:italic> detected an additional radiation belt trapped within the rings, sustained by the radioactive decay of free neutrons. Lamy <jats:italic>et al.</jats:italic> present plasma measurements taken as Cassini flew through regions emitting kilometric radiation, connected to the planet's aurorae. Hsu <jats:italic>et al.</jats:italic> determined the composition of large, solid dust particles falling from the rings into the planet, whereas Mitchell <jats:italic>et al.</jats:italic> investigated the smaller dust nanograins and show how they interact with the planet's upper atmosphere. Finally, Waite <jats:italic>et al.</jats:italic> identified molecules in the infalling material and directly measured the composition of Saturn's atmosphere. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.aat5434">eaat5434</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.aat1962">eaat1962</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.aat2027">eaat2027</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.aat3185">eaat3185</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.aat2236">eaat2236</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" related-article-type="in-this-issue" xlink:href="10.1126/science.aat2382">eaat2382</jats:related-article> </jats:p>

<jats:p>Puerto Rico is not prepared for another hurricane. A year ago, Hurricane María obliterated the island's electric grid, leading to the longest power outage in U.S. history. This disrupted medical care for thousands and contributed to an estimated 2975 deaths. The hurricane caused over $90 billion in damage for an island already in economic crisis. Although authorities claim that power was restored completely, some residents still lack electricity. Despite recovery efforts, the continued vulnerability of the energy infrastructure threatens Puerto Rico's future. But disruptions create possibilities for change. Hurricane María brought an opportunity to move away from a fossil fuel–dominant system and establish instead a decentralized system that generates energy with clean and renewable sources. This is the path that will bring resilience to Puerto Rico.</jats:p>

<jats:p>A roundup of weekly science policy and related news.</jats:p>

<jats:p>European-Japanese mission will examine idea that innermost planet formed out past Mars.</jats:p>

<jats:p>Prize honors discoveries that led to optical tweezers and short, powerful bursts of laser light.</jats:p>

<jats:p>Prize goes to discoveries that unleash immune system.</jats:p>

<jats:p>Biologist Elena Álvarez-Buylla has spoken out against transgenic maize.</jats:p>

<jats:p>U.S. Department of Transportation weighs whether to investigate complaint by leading research organization.</jats:p>

<jats:p>Streams of stars falling into our galaxy trace its history and mass. They may even record encounters with clumps of dark matter.</jats:p>