This is a highly interactive science exhibition, focusing on NASA's Earth Observing System, at the Children's Science Explorium, 300 S. Military Tr., Boca Raton. Designed primarily for families and school groups, visitors learn what a satellite is, discover the different types of orbits, and explore cutting-edge technology similar to that used by EOS scientists. Exhibits and workstations include: Design a Satellite; Mission Kiosk; Image Gallery; What Goes Around; Hot or Not; Ozone Zone; The Bigger the Better; Earth Today and much more. Exhibit runs through April during regular hours. M-F 9 am-6 pm, Weekends/holidays 10 am-5 pm. $5. 347-3912 or www.scienceexplorium.org.