... The dark site's rarefied atmosphere, at about 50 percent sea level pressure, is also extremely dry. ... W5: Pillars of Star Formation . ... A study of star forming region W5 by the sun-orbiting Spitzer Space Telescope provides clear clues by recording that massive stars near the center of empty cavities are older than stars near the edges. ... A Colorful Side of the Moon . ... This colorful topographical map of the Moon is centered on the lunar farside, the side not seen from planet Earth. ...