Jupiter to several seconds, and short bursts (or S-bursts) that had a duration of less than a hundredth of a second. Scientists discovered that there were three forms of radio signals transmitted from Jupiter. Since 1973 a number of automated spacecraft have visited Jupiter, most notably the "Pioneer 10" space probe, the first spacecraft to get close enough to Jupiter to send back revelations about the properties and phenomena of the Solar System's largest planet. Flights to other planets within the Solar System are accomplished at a cost in energy, which is described by the net change in velocity of the
Japanese Lunar Exploration Program planned mission to Mars, consisting of an orbiter (MELOS-1), and a lander (MELOS-2). It would be the successor to the comet probe Suisei (PLANET-A) the Mars probe Nozomi (PLANET-B), and the Venus probe Akatsuki (PLANET-C). MELOS-1 is planned to be launched in 2018, and will also have up to four small landers. Hiten, or MUSES-A (Mu Space Engineering Satellite-A) is a technology demonstration satellite built by ISAS, launched on January 24, 1990. LUNAR-A was an ISAS mission consisting of a lunar space craft which would have carried two penetrators to the Moon, and deploy them at an altitude of 40