File:Light at Night.jpg
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English: It’s difficult to believe that this photo was captured at nightime. The impressive peak of Maunakea — the dormant volcano that houses Gemini North, of the international Gemini Observatory, a Program of NSF’s NOIRLab — appears to be clearly lit under a bright blue sky. Shadows are even visiblebetween the dormant volcano’s cracks and crevices. There are two clues that this image was actually taken at nighttime. First, the bright streaks in the sky are actually star trails — streaks of starlight, which appear when a photographer uses a long exposure. They are due to the Earth’s rotation on its own axis. The second clue is subtler. In the bottom left corner of the image, artificial lights can be seen. These lights would not be required in daytime. The overall brightness of the image is caused by such a long exposure time, so the camera had time to collect a lot of starlight and moonlight, creating an image that appears to be Sun-drenched!
Español: Resulta difícil creer que esta fotografía se haya tomado de noche. La impresionante cumbre de Maunakea —el volcán inactivo que alberga a Gemini Norte, parte del Observatorio Gemini, un Programa de NOIRLab de NSF— se ve claramente iluminada bajo un cielo azul brillante. Incluso se ven sombras entre las grietas y fisuras del volcán durmiente.
Hay dos indicios que revelan que esta imagen en realidad se tomó durante la noche: En primer lugar, las brillantes líneas en el cielo son en realidad senderos estelares o startrails —rastros de estrellas que aparecen como efecto de la rotación de la Tierra sobre su propio eje, cuando se toma una fotografía con una larga exposición. La segunda pista es más sutil: En la esquina inferior izquierda de la imagen se pueden ver luces artificiales, luces que no se necesitan encender durante el día. El brillo general de esta imagen se debe a un largo tiempo de exposición fotográfica durante una noche con Luna, por lo que la cámara tuvo el tiempo de capturar bastante luz estelar y lunar, creando una imagen nocturna que parece tener los toques cálidos del Sol. |
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| Source | https://noirlab.edu/public/images/iotw2208a/ |
| Author | International Gemini Observatory/NOIRLab/NSF/AURA/J. Chu |
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This media was created by the National Optical-Infrared Astronomy Research Laboratory (NOIRLab).
Their website states: "Unless specifically noted, the images, videos, and music distributed on the public NOIRLab website, along with the texts of press releases, announcements, images of the week and captions; are licensed under a Creative Commons Attribution 4.0 International License, and may on a non-exclusive basis be reproduced without fee provided the credit is clear and visible." To the uploader: You must provide a link (URL) to the original file and the authorship information if available. |
  This file is licensed under the Creative Commons Attribution 4.0 International license.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:01, 22 June 2023 | | 4,256 × 2,832 (2.35 MB) | C messier (talk | contribs) | full size |
| 20:09, 30 January 2023 |  | 1,280 × 852 (191 KB) | Yiseth Romero (talk | contribs) | Uploaded a work by International Gemini Observatory/NOIRLab/NSF/AURA/J. Chu from https://noirlab.edu/public/images/iotw2208a/ with UploadWizard |
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