Percepción del Cuidado del Agua de Estudiantes Secundarios Chilenos. La Construcción de un Nuevo Mundo está en la Juventud

El presente estudio buscó conocer la percepción de estudiantes secundarios de Chile respecto al significado del cuidado del agua. 1Para ello se realizó un estudio descriptivo, que consistió en una aplicación on line de una encuesta a 120 estudiantes (65% mujeres, una media de edad de 15,8 años, dt=1,64 años). Un 78,9% de las y los estudiantes consideran que el agua es un recurso que debe ser cuidado. Un 68,6% considera que el ahorro del agua es importante, Un 44,3% de los participantes señala que ha recibido orientación respecto a cómo cuidar el recurso. Un 31,6% señala que ahora agua porque no dispone el recurso como agua potable. Los resultados muestran que se debe generar mayor educación respecto al cuidado del agua, por un lado. Resulta preocupante que un porcentaje importante no tenga acceso a agua potable.This study sought to know the perception of secondary students in Chile regarding the meaning of water care.  For this purpose, a descriptive study was carried out, consisting of an online application of a survey of 120 students (65% female, an average age of 15.8 years, SD: 1.64 years). 78.9% of students consider water to be a resource that needs to be cared for.  68.6% believe that water savings are important, 44.3% of participant’s report that they have received guidance on how to take care of the resource. 31,6% say that water now because it does not provide for the resource as drinking water. The results show that more education should be generated regarding water care on the one hand.  Worryingly, a significant percentage do not have access to safe drinking water

Size and Shape Constraints of (486958) Arrokoth from Stellar Occultations

International audienceWe present the results from four stellar occultations by (486958) Arrokoth, the flyby target of the New Horizons extended mission. Three of the four efforts led to positive detections of the body, and all constrained the presence of rings and other debris, finding none. Twenty-five mobile stations were deployed for 2017 June 3 and augmented by fixed telescopes. There were no positive detections from this effort. The event on 2017 July 10 was observed by the Stratospheric Observatory for Infrared Astronomy with one very short chord. Twenty-four deployed stations on 2017 July 17 resulted in five chords that clearly showed a complicated shape consistent with a contact binary with rough dimensions of 20 by 30 km for the overall outline. A visible albedo of 10% was derived from these data. Twenty-two systems were deployed for the fourth event on 2018 August 4 and resulted in two chords. The combination of the occultation data and the flyby results provides a significant refinement of the rotation period, now estimated to be 15.9380 ± 0.0005 hr. The occultation data also provided high-precision astrometric constraints on the position of the object that were crucial for supporting the navigation for the New Horizons flyby. This work demonstrates an effective method for obtaining detailed size and shape information and probing for rings and dust on distant Kuiper Belt objects as well as being an important source of positional data that can aid in spacecraft navigation that is particularly useful for small and distant bodies