A 'lua azul', desde a ilha de Manhattan (Nova Iork).
2015-08-04
Imagenes del Mundo - La niña y la luna llena
Silueta de una niña fotografiada en un parque de atracciones de Kansas (Estados Unidos) frente a la luna llena.
Astronomy picture of the day - 2015 August 4 - Virgo Cluster Galaxies
Image Credit & Copyright: Rogelio Bernal Andreo
Explanation: Well over a thousand galaxies are known members of the Virgo Cluster, the closest large cluster of galaxies to our own local group. In fact, the galaxy cluster is difficult to appreciate all at once because it covers such a large area on the sky. This careful wide-field mosaic of telescopic images clearly records the central region of the Virgo Cluster through faint foreground dust clouds lingering above the plane of our own Milky Way galaxy. The cluster's dominant giant elliptical galaxy M87, is just below and to the left of the frame center. To the right of M87 is a string of galaxies known as Markarian's Chain. A closer examination of the image will reveal many Virgo cluster membergalaxies as small fuzzy patches. Sliding your cursor over the image will label the larger galaxies using NGC catalog designations. Galaxies are also shown with Messier catalog numbers, including M84, M86, and prominent colorful spirals M88, M90, and M91. On average, Virgo Cluster galaxies are measured to be about 48 million light-years away. The Virgo Cluster distance has been used to give an important determination of the Hubble Constant and the scale of the Universe.
2015-08-03
25 miradouros em Lisboa - Santa Catarina
The port of Lisbon and the landmark 25 de Abril Bridge are seen from this terrace, where you may also sit and watch the cruise ships navigating by, or stay for the sunset.
O porto de Lisboa e a Ponte 25 de Abril são vistos deste terraço, onde se pode fazer uma pausa e observar os cruzeiros a passar, ou ficar para o pôr do sol.
Astronomy picture of the day - 2015 August 3 - A Proton Arc Over Lake Superior
Image Credit & Copyright: Ken Williams
Explanation: The setting had been picked out -- all that was needed was an aurora. And late last August, forecasts predicted that an otherwise beautiful night sky would be lit up with auroral green. Jumping into his truck, the astrophotographer approached his secret site -- but only after a five hour drive across the rural Upper Peninsula of Michigan. What he didn't know was that his luck was just beginning. While setting up for the image, a proton arc -- a rare type of aurora -- appeared. The red arc lasted only about 15 minutes, but that was long enough to capture in a 30-second exposure. As the name indicates, proton arcs are caused not by electrons but by more massive protons thatbombard the Earth's atmosphere following an energetic event on the Sun. In the featured image, the yellow lights on the horizon are the city lights of Marquette, Michigan, USA. The blue and yellow rocks in the Lake Superiorforeground are lit by a LED flashlight. Also captured, to the left of the red proton arc, was the band of our Milky Way Galaxy.
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