... The large Martian crater above just left of center: is this a fresh crater, a degraded crater, or a ghost crater? ... Brahe, who lived between 1546 and 1601, set out to solve the day's most pressing astronomical problem: to determine whether the Earth or the Sun was at the center of the Solar System. ... Second Millennium, Last Eclipse . ... In the center of the Lagoon Nebula one finds glowing gas, star clusters, and dense knots of gas and dust just now forming stars. ... Welcome to millennium three...