The night of June 12, 2006 is crystal clear. And cold. Lake Tekapo, 300 meters below the University of Canterbury’s Mount John Observatory, shines eerily in the silver-white light of the full moon. The stars of the Southern Cross twinkle above the southern horizon. Below the Moon to the right, in the constellation of Serpens, Pluto moves in front of a star. But the domes of the observatory remain shut. This rare event cannot be observed.