A Hole in Mars

Credit: NASA, JPL, U. Arizona

Explanation: Black spots have been discovered on Mars that are so dark that nothing inside can be seen. Quite possibly, the spots are entrances to deep underground caves capable of protecting Martian life, were it to exist. The unusual hole pictured above was found on the slopes of the giant Martian volcano Arsia Mons. The above image was captured three weeks ago by the HiRISE instrument onboard the Mars Reconnaissance Orbiter currently circling Mars. The holes were originally identified on lower resolution images from the Mars Odyssey spacecraft, The above hole is about the size of a football field and is so deep that it is completely unilluminated by the Sun. Such holes and underground caves might be prime targets for future spacecraft, robots, and even the next generation of human interplanetary explorers.

MEMORIAL DAY 2007

Memorial Day was originally known as Decoration Day because it was a time set aside to honor the nation's Civil War dead by decorating their graves. It was first widely observed on May 30, 1868, to commemorate the sacrifices of Civil War soldiers, by proclamation of General John A. Logan of the Grand Army of the Republic, an organization of former sailors and soldiers. On May 5, 1868, Logan declared in General Order No. 11 that.......

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Credit and Courtesy : The History Channel and United States Air Force.

Venus Near the Moon

Credit & Copyright: Jay Ouellet

Explanation: The two brightest objects in the night sky appeared to go right past each other last week. On the night of May 19, Earth's Moon and the planet Venus were visible in the same part of the sky, and at closest approach were less than one degree apart. The conjunction was captured in the above image taken from near Quebec City, Quebec, Canada. Venus appears on the lower left of the above photo. The spires that appear to emanate from Venus are diffraction spikes caused by the camera itself. The image is so clear that craters on the Moon are resolved. Of course, the real physical distance between the two heavenly bodies was not unusually small -- the apparent conjunction was really just an illusion of perspective. Although Earth's Moon passes Venus once each month, such a close passing visible in the evening sky is more rare.
Tomorrow's picture: flowers in space