were there any canceled ones?
NASA's "JIMO" was cancelled in 2005.
Jupiter
NASA's "JIMO" ("Jupiter Icy Moons Orbiter") was cancelled in 2005.
which of jupiter's moons has water ice surface Europa who discovered it? Galileo Galilei was he the one who named it? The naming scheme was suggested by Simon Marius, who attributed the proposal to Johannes Kepler what is the speciality of it's atmosphere? The surface-bounded atmosphere forms through radiolysis, the dissociation of molecules through radiation. Solar ultraviolet radiation and charged particles from the Jovian magnetospheric environment collide with Europa's icy surface, splitting water into oxygen and hydrogen constituents. has there been any exploration on it? Yes, it began with the Jupiter flybys of "Pioneer 10" and "11" in 1973 and 1974 respectively. any mission scheduled for the future? Conjectures regarding extraterrestrial life have ensured a high profile for Europa and have led to steady lobbying for future missions. how many such moons there of this planet? 79 how big is the planet? Jupiter is much larger than Earth and considerably less dense: its volume is that of about 1,321 Earths, but it is only 318 times as massive can you mention any flyby missions done here? Voyager missions,  "Ulysses", etc.
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Jupiter [SEP] Canceled missions
There has been great interest in studying the icy moons in detail because of the possibility of subsurface liquid oceans on Jupiter's moons Europa, Ganymede, and Callisto. Funding difficulties have delayed progress. NASA's "JIMO" ("Jupiter Icy Moons Orbiter") was cancelled in 2005. A subsequent proposal was developed for a joint NASA/ESA mission called EJSM/Laplace, with a provisional launch date around 2020. EJSM/Laplace would have consisted of the NASA-led Jupiter Europa Orbiter and the ESA-led Jupiter Ganymede Orbiter. However, ESA had formally ended the partnership by April 2011, citing budget issues at NASA and the consequences on the mission timetable. Instead, ESA planned to go ahead with a European-only mission to compete in its L1 Cosmic Vision selection.