University of Arizona space scientists are inviting the public to join them on campus at a special open house at the Lunar and Planetary Laboratory (LPL) 6 p.m. – 9 p.m. next Tuesday, Oct. 23, as the 2001 Mars Odyssey spacecraft arrives at Mars. The State of Arizona has a lot riding on the mission — namely two of the three primary science instruments, said LPL director Michael Drake.