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2016-07-30

Imagens do Mundo - Sitios lindos de Portugal - Evora

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Imagens do Mundo - Ruas floridas - Valência, Espanha

Imagens do Mundo - Brasil olimpico - Arena de volei de praia - Praia de Copacabana

Vista aérea da arena de vôlei de praia e da praia de Copacabana Foto: YASUYOSHI CHIBA / AFP

Imagens do Mundo - Ruas floridas - Porto Alegre, Brasil

The Script - "Six degrees of separation" - Video - Music

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"Six degrees of separation"

Bob Dylan & Eric Clapton - "Don't think twice, it's all right" - Video - Music - Live

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"Don't think twice, it's all right"

Astronomy picture of the day - 2016 July 30 - Ripples Through a Dark Sky

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Ripples Through a Dark Sky 
Image Credit & CopyrightP-M Hedén (Clear SkiesTWAN)
Explanation: Sunlight ripples through a dark sky on this Swedish summer midnight as noctilucent or night shining clouds seem to imitate the river below. In fact, the seasonal clouds often appear at high latitudes in corresponding summer months. Also known as polar mesospheric clouds, they form as water vapor is driven into the cold upper atmosphere. Fine dust supplied by disintegrating meteors or volcanic ash provides sites where water vapor can condense, turning to ice at the cold temperatures in the mesosphere. Poised at the edge of space some 80 kilometers above, these icy clouds really do reflect sunlight toward the ground. They are visible here even though the Sun itself was below the horizon, as seen on July 16 from Sweden's Färnebofjärdens National Park.