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The article discusses the tendency of several bright stars to lie closer to the North Celetial Pole before the Polaris star assumes the mantle of North Star due to gravitational influences from the Sun and Moon.

The article discusses the mapping mission of the moon's gravitational field. The National Aeronautical and Space Administration's (NASA) Gravity Recovery and Interior Laboratory (GRAIL) started it on December 17, 2011. It was carried out by their probes named Ebb and Flow, and it was finished on May 30, 2012.

The article discusses the Gravity Recovery and Interior Laboratory (GRAIL), a pair of spacecraft launched by the U.S. National Aeronautics and Space Administration (NASA) which will study the lunar gravity field, lunar impact craters, and mascons, according to geophysicist Jay Melosh of the GRAIL team.

This article reports on NASA's Discovery program, which researches proposed space missions. One of these is the Venus Sounder for Planetary Exploration orbiter, designed to investigate Venus's atmospheric composition and dynamics. Another mission selected is the Gravity Recovery and Interior Laboratory Moon mission, designed to map lunar gravity in detail.