Ever wonder exactly what sort of rocks litter the Moon’s surface in countless bright and dark blotches? Check out the U.S. Geological Survey’s new Moon map covering the entire surface of Earth’s satellite in extraordinary detail. The Unified Geologic Map of the Moon will “serve as the definitive blueprint of the Moon’s surface geology for future human missions and will be invaluable for the international scientific community, educators and the public at large,” says the USGS. The new map is based on images and data from six Apollo regional maps and observations from more recent missions, including laser altimetry for the north and south polar regions, provided by the Lunar Orbiter, and stereo observations of equatorial areas by Japan’s SELENE spacecraft. Researchers developed a unified description of the moon’s stratigraphy and resolved inconsistencies in earlier maps.
A scholarly investigation of the Cairo Calendar papyrus (1244–1163 B.C.) has led researchers at the University of Helsinki to conclude that the ancient Egyptians were aware that the variable star Algol (beta Persei) had a 2.85-day period. Given that the star’s current period is 2.8673 days, this supports the theory that mass transfer between the stars of this eclipsing binary has caused a long-term increase of its orbital period.
In the dawn twilight of Saturday, 5 September, observers in the British Isles with clear skies can see the last quarter Moon pass in front of first-magnitude star Aldebaran in the constellation Taurus — the brightest star (aside from the Sun) to be occulted by the Moon as seen from the UK this year.