Learn about water on Mars and other aspects of our celestial neighbor’s hostile environment when Dr. Steven Lee speaks today at the Orlando Science Center. Lee is an expert on the planet. He monitors Mars with the Hubble Space Telescope and helped develop the camera system aboard the Mars Climate Orbiter, a spacecraft that was lost before it reached Mars in 1999. He is science adviser for the traveling exhibition, “Mars-Quest,” which opens today at the science center and runs through May 6.