Hui a les 16
hores i 49 minuts hora local es produix l'equinocci de tardor.
El Día sin Coches es una convocatoria de ámbito internacional,
apoyada desde el año 2000 por la Comisión Europea.
En 1974 diversos gobiernos europeos ya tuvieron la idea de
celebrar un día sin coches ante la crisis energética que sufrían. La
experiencia no volvió a repetirse hasta mediados de los años ochenta, por
iniciativa de las organizaciones ecologistas.
El principal objetivo de este día es potenciar el transporte público como medio
alternativo y concienciar a los ciudadanos de los efectos que los automóviles
tienen sobre el medio ambiente.
El último vuelo del 'Endeavour' pone fin a una era de exploración espacial; La NASA descubre hidrógeno en el asteroide Vesta; Determinan el comportamiento energético del proceso de formación del ADN; Confirman el primer foco de mosquito tigre en Mallorca; Más cerca de una vacuna contra el ántrax; ¿Es posible estar embarazada y no saberlo?; Alzhéimer: El caso Utermohlen;
Llibre: Cómo conservar un cerebro joven; i Nuevas formas de comer pescado.
The X-Ray Sun Over 5.5 Years
Behold five and a half years worth of full-sun observations from XRT. A dramatic illustration of the solar cycle, this movie begins about one year before the first reversed-polarity sunspot ushered in the current cycle on January 8, 2008. The solar cycle is a periodic variation in the Sun's activity that is caused by the gradual 'tangling' and eventual reversal of its magnetic field.
NASA Now Minute: Curiosity -- Impact on the Future of Space Exploration
Your challenge, should you choose to accept it, is to become the next scientist, engineer or mathematician who will help us understand more about our place in the universe. NASA Now Minutes are excerpts from a weekly current events program available for classroom use at the NASA Explorer Schools Virtual Campus located at:› http://explorerschools.nasa.gov.
Crystal Oscilator Investigation - Stories from the Materials and Electrical Components Lab
The lab is an impartial authority - decades of accumulated experience to back up project teams, equipped to carry out a wide variety of tests inhouse, or turn to a network of external facilities when required.
The Materials and Electrical Components lab supports ESA projects through all stages of development, including on-orbit troubleshooting. Accuracy is very important, and so is speed: It aims to schedule critical activities to keep projects on track. It also carries out its own verification of industrial work contributing to a project, and can advise on improving manufacturing processes as needed. The lab can also advise on non-ESA space projects depending on its availability.
Preventative work now, down on the ground, is important to ensure mission success and to minimise risks. Failure really isn't an option for spacecraft and launchers beyond a set range of redundant systems - to work as planned, the component parts going into a mission have to perform perfectly. The lab's work gives confidence this will indeed be the case.
The lab's various specialists join forces to generate synergies: Materials and processes experts assess how the spacecraft is put together, with what materials, and in what way. Then the electrical component experts assess the functioning of the electrical, electronic and electro-mechanical components, the fundamental building blocks of a space mission.
The Materials and Electrical Components lab supports ESA projects through all stages of development, including on-orbit troubleshooting. Accuracy is very important, and so is speed: It aims to schedule critical activities to keep projects on track. It also carries out its own verification of industrial work contributing to a project, and can advise on improving manufacturing processes as needed. The lab can also advise on non-ESA space projects depending on its availability.
Preventative work now, down on the ground, is important to ensure mission success and to minimise risks. Failure really isn't an option for spacecraft and launchers beyond a set range of redundant systems - to work as planned, the component parts going into a mission have to perform perfectly. The lab's work gives confidence this will indeed be the case.
The lab's various specialists join forces to generate synergies: Materials and processes experts assess how the spacecraft is put together, with what materials, and in what way. Then the electrical component experts assess the functioning of the electrical, electronic and electro-mechanical components, the fundamental building blocks of a space mission.
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