A rippled dune front in Herschel Crater on Mars moved an average of about two meters (about two yards) between March 3, 2007 and December 1, 2010, as seen in these images from NASA’s Mars Reconnaissance Orbiter. Note that the pattern of ripples on the dune surface has changed completely between the two images. Image credit: NASA/JPL-Caltech/Univ. of Ariz./JHUAPL
The photo above shows a gathering of planets and the waning crescent Moon as captured from Tivoli, Namibia in Africa, just before dawn on May 30, 2011. The “Big Five” in Africa refers to the top five big game animals; lion, leopard, rhinoceros, Cape buffalo, and elephant. Photographer: Eduard von Bergen.
In his famous lecture, “Life in the Universe”, Stephen Hawking asks: “What are the chances that we will encounter some alien form of life, as we explore the galaxy?” If the argument about the time scale for the appearance of life on Earth is correct, Hawking says “there ought to be many other stars, whose planets have life on them.
On Friday, November 25, an annular eclipse will occur, reaching a maximum coverage at 06:20:17 UT of magnitude .905. It will be the largest – and last – partial eclipse of the year. But its visibility will be limited to the most southern latitudes… outside of the Antarctic continent, only New Zealand, Tasmania and parts of South Africa will have any visibility of the event.
This NASA montage of New Horizons images shows Jupiter and its volcanic moon Io, taken during the spacecraft’s Jupiter flyby in early 2007. The image shows a major eruption in progress on Io’s night side, at the northern volcano Tvashtar. Incandescent lava glows red beneath a volcanic plume, whose uppermost portions are illuminated by sunlight. The plume appears blue due to scattering of light by small particles within it. Picture: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute/Goddard Space Flight Center/AFP