In the evening Sky

Harrat Khaybar

Harrat Khaybar

Harrat Khaybar, Saudi Arabia lies in the western half of the Arabian peninsula and contains not only large expanses of sand and gravel, but also extensive lava fields known as haraat (harrat for a named field). According to scientists, the volcanic field was formed by eruptions along a long north-south linear vent system over the past 5 million years; the most recent recorded eruption took place between 600-700 A.D.

The presence of tuff cones -- formed by eruption of lava in the presence of water together with other volcanic features indicative of water -- in the Harrat Khaybar suggest that the local climate was much wetter during some periods of volcanic activity. Today, however, the regional climate is hyperarid -- little to no yearly precipitation -- leading to an almost total lack of vegetation.

The image was taken by the Expedition 16 crew aboard the Inernational Space Station in March 2008.

Mars Dunes of Proctor Crater

Dark Dune Fields of Proctor Crater, Mars

The dark rippled dunes of Mars' Proctor Crater likely formed more recently than the lighter rock forms they appear to cover, and are thought to slowly shift in response to pervasive winds. The dunes arise from a complex relationship between the sandy surface and high winds on Mars. Similar dunes were first seen in Proctor Crater by Mariner 9 more than 35 years ago.

This image was taken by HiRISE camera on board the Mars Reconnaissance Orbiter, currently in orbit around Mars.

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Wulkan Toba

Jesteś wyjątkowy/wyjątkowa- jesteś potomkiem małej ale za to kreatywnej grupy silnych ludzi, którzy 73.500 tyś lat temu zmierzyli się z katastrofalnymi zmianami klimatu i otaczającego ich środowiska, co nastąpiło po wybuchu superwulkanu Toba (Genetic Bottleneck Theory)

Toba Catastrophe Theory

Siła rażenia bomb atomowych

http://www.2upblog.pl/2010/11/03/ground-zero-ii/#more-10871