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
Helena Russell stated his given name was 'Telford'.) In 1994, Helena was widowed when Lee Russell departed on the Astro Seven mission to Jupiter and never returned. All hands of the mission were declared dead. The couple never had children. After her husband's death, she was employed on Earth by the World Space Commission. In 1997, she was part of a team evaluating the mental state of Captain Tony Cellini. Cellini, the sole survivor of the Ultra Probe mission, returned to Earth speaking of his ordeal with a deadly space 'dragon' lifeform in a spaceship graveyard on the far side of planet