"Caribbean blue"
2015-10-31
Imagens - Maravilhas de Cuba - Una playa de arena cristalina y aguas turquesas en Cuba. - Cayo Coco?
Una playa de arena cristalina y aguas turquesas en Cuba.
LINDA L. BAKER
Astronomy picture of the day - 2015 October 31 - Ghosts and Star Trails
Image Credit & Copyright: Chris Kotsiopoulos (GreekSky)
Explanation: Don't be scared. Stars won't fall from the sky and ghosts won't really haunt your neighborhood tonight. But it looks like they might be doing just that in this eerie picture of an eccentric old abandoned house in moonlight. A treat for the eye the image is a trick of stacked multiple exposures, 60 frames exposed for 25 seconds each. While the digital frames were recorded with a camera fixed to a tripod stars traced concentric arcs about the north celestial pole, only a reflection of planet Earth's rotation on its axis. Conveniently marked by bright star Polaris, the pole could be positioned above the peaks of the deserted dwelling. Wrapped in a blanket to stay warm, the photographer's own movements during the exposures were blended into the ghostly apparitions. Of course, the grinning Jack-o-Lantern is there to wish you a safe and Happy Halloween!
2015-10-30
Astronomy picture of the day - 2015 October 30 - Charon and the Small Moons of Pluto
Image Credit: NASA, Johns Hopkins U. APL, SwRI
Explanation: What do the moons of Pluto look like? Before a decade ago, only the largest moon Charon was known, but never imaged. As the robotic New Horizons spacecraft was prepared and launched, other moons were identified on Hubble images but remained only specks of light. Finally, this past summer, New Horizons swept right past Pluto, photographed Pluto and Charon in detail, and took the best images of Styx, Nix, Kerberos, and Hydra that it could. The featured image composite shows the results -- each moon is seen to have a distinct shape, while underlying complexity is only hinted. Even though not satisfyingly resolved, these images are likely to be the best available to humanity for some time. This is because the moons are too small and distant for contemporary Earth-based telescopes to resolve, and no new missions to the Pluto system are planned.
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