earth clock with google maps :)
Quand les lumières s'allument
Il y a quelque chose de particulièrement fascinant à observer notre monde depuis l'espace après le coucher du soleil. Mais c'est bien plus qu'une jolie image : il y a beaucoup à apprendre de toutes ces lumières scintillantes. Ces 25 dernières années, la NASA a utilisé les images satellite de nuit de la Terre pour mener des recherches dans les domaines économique, social et environnemental. Ces clichés nocturnes, baptisés Marbre noir, permettent notamment d'étudier la pollution lumineuse dans les écosystèmes fragiles et fournissent des informations en temps réel à la suite de catastrophes naturelles.
Cette image composite de notre planète en 2016 (publiée début 2017) a été créée au laboratoire des systèmes d'information terrestre du centre de vol spatial Goddard de la NASA, à partir de données provenant du satellite Suomi National Polar-orbiting Partnership (NPP), lancé en 2011 par la NASA, l'Agence américaine d'observation océanique et atmosphérique (NOAA) et le département de la Défense des États-Unis.
Découvrez ici cinq endroits du globe particulièrement étonnants lorsqu'on les regarde la nuit. Mais le Marbre noir de la NASA renferme de nombreux autres joyaux.
Black Image = International Space Station (ISS) is on the night side of the Earth.
Gray Image = Switching between cameras, or communications with the ISS is not available.
No Audio = Normal. There is no audio on purpose. Add your own soundtrack.
For a display of the real time ISS location plus the HDEV imagery, visit here: http://eol.jsc.nasa.gov/HDEV/
The High Definition Earth Viewing (HDEV) experiment aboard the ISS was activated April 30, 2014. It is mounted on the External Payload Facility of the European Space Agency’s Columbus module. This experiment includes several commercial HD video cameras aimed at the earth which are enclosed in a pressurized and temperature controlled housing. Video from these cameras is transmitted back to earth and also streamed live on this channel. While the experiment is operational, views will typically sequence though the different cameras. Between camera switches, a gray and then black color slate will briefly appear. Since the ISS is in darkness during part of each orbit, the images will be dark at those times. During periods of loss of signal with the ground or when HDEV is not operating, a gray color slate or previously recorded video may be seen.
Analysis of this experiment will be conducted to assess the effects of the space environment on the equipment and video quality which may help decisions about cameras for future missions. High school students helped with the design of some of the HDEV components through the High Schools United with NASA to Create Hardware (HUNCH) program. Student teams will also help operate the experiment. To learn more about the HDEV experiment, visit here: http://www.nasa.gov/mission_pages/station/research/experiments/917.html