Exploration of Jupiter reach Europa after a 6.5 year cruise. The spacecraft would fly by the moon 32 times to minimize radiation damage. Because of the possibility of subsurface liquid oceans on Jupiter's moons Europa, Ganymede and Callisto, there has been great interest in studying the icy moons in detail. Funding difficulties have delayed progress. The "Europa Orbiter" was a planned NASA mission to Europa, which was canceled in 2002. Its main objectives included determining the presence or absence of a subsurface ocean and identifying candidate sites for future lander missions. NASA's "JIMO" ("Jupiter Icy Moons Orbiter"), which was canceled in 2005, and
Caverns of Mars The system is similar to the one used in "Moon Patrol". The game also added a pause feature. In 1983, Atari released "Caverns of Mars" on a cartridge (RX8021). In 2005, a version of "Caverns of Mars" was included on the Atari Flashback 2 classic game console. Datamost's "Cavern Creatures" (1983) for the Apple II and homebrew game "Conquest of Mars" (2006) for the Atari 2600 are both direct clones. "Computer Gaming World" called "Caverns of Mars" "delightful ... addictive and excellently paced". It noted the age of the author and stated that the game "has all the look, feel,