A European spacecraft rocketed away Friday on a decade-long quest to explore Jupiter and three of its icy moons that could have buried oceans.
The journey began with a morning liftoff by Europe鈥檚 Ariane rocket from French Guiana in South America. Arianespace鈥檚 chief executive Stephane Israel called it 鈥渁n absolutely perfect launch.鈥�
But there were some tense minutes later as controllers waited for signals from the spacecraft nearly an hour into the flight.
When contact was confirmed, European Space Agency鈥檚 Bruno Sousa declared from Mission Control in Germany: 鈥淭he spacecraft is alive!鈥�
It will take the robotic explorer, dubbed Juice, eight years to reach Jupiter, where it will scope out not only the solar system鈥檚 biggest planet but also Europa, Callisto and Ganymede. The three ice-encrusted moons are believed to harbor underground oceans, where sea life could exist.
Then in perhaps the most impressive feat of all, Juice will attempt to go into orbit around Ganymede: No spacecraft has ever orbited a moon other than our own.
With so many moons,鈥� at last count 95 鈥� astronomers consider Jupiter a mini solar system of its own, with missions like Juice long overdue.
鈥淲e are not going to detect life with Juice,鈥� stressed the European Space Agency鈥檚 project scientist, Olivier Witasse.
But learning more about the moons and their potential seas will bring scientists closer to answering the is-there-life-elsewhere question. 鈥淭hat will be really the most interesting aspect of the mission,鈥� he said.
Juice is taking a long, roundabout route to Jupiter, covering 4 billion miles (6.6 billion kilometers)
It will swoop within 125 miles (200 kilometers) of Callisto and 250 miles (400 kilometers) of Europa and Ganymede, completing 35 flybys while circling Jupiter. Then it will hit the brakes to orbit Ganymede, the primary target of the 1.6 billion-euro mission (nearly $1.8 billion).
Ganymede is not only the solar system鈥檚 largest moon 鈥� it surpasses Mercury 鈥� but has its own magnetic field with dazzling auroras at the poles.
Even more enticing, it鈥檚 thought to have an underground ocean holding more water than Earth. Ditto for Europa and its reported geysers, and heavily cratered Callisto, a potential destination for humans given its distance from Jupiter鈥檚 debilitating radiation belts, according to Carnegie Institution鈥檚 Scott Sheppard, who鈥檚 not involved with the Juice mission.
鈥淭he ocean worlds in our solar system are the most likely to have possible life, so these large moons of Jupiter are prime candidates to search,鈥� said Sheppard, a moon hunter who鈥檚 helped discover well over 100 in the outer solar system.
The spacecraft, about the size of a small bus, won鈥檛 reach Jupiter until 2031, relying on gravity-assist flybys of Earth and our moon, as well as Venus.
鈥淭hese things take time 鈥� and they change our world,鈥� said the Planetary Society鈥檚 chief executive, Bill Nye. The California-based space advocacy group organized a virtual watch party for the launch.
Belgium鈥檚 King Philippe and Prince Gabriel, and a pair of astronauts 鈥� France鈥檚 Thomas Pesquet and Germany鈥檚 Matthias Maurer 鈥� were among the spectators in French Guiana. Thursday鈥檚 launch attempt was nixed by the threat of lightning.
Juice 鈥� short for Jupiter Icy Moons Explorer 鈥� will spend three years buzzing Callisto, Europa and Ganymede. The spacecraft will attempt to enter orbit around Ganymede in late 2034, circling the moon for nearly a year before flight controllers send it crashing down in 2035, later if enough fuel remains.
Europa is especially attractive to scientists hunting for signs of life beyond Earth. Juice will keep its Europa encounters to a minimum, however, because of the intense radiation there so close to Jupiter.
Juice鈥檚 sensitive electronics are encased in lead to protect against radiation. The 14,000-pound (6,350-kilogram) spacecraft also is wrapped with thermal blankets 鈥� temperatures near Jupiter hover around minus 380 degrees Fahrenheit (minus 230 degrees Celsius). And its solar panels stretch 88 feet (27 meters) tip to tip to soak in as much sunlight that far from the sun.
Late next year, NASA will send an even more heavily shielded spacecraft to Jupiter, the long-awaited Europa Clipper, which will beat Juice to Jupiter by more than a year because it will launch on SpaceX鈥檚 mightier rocket. The two spacecraft will team up to study Europa like never before.
NASA has long dominated exploration at Jupiter, beginning with flybys in the 1970s by the twin Pioneers and then Voyagers. Only one spacecraft remains humming at Jupiter: NASA鈥檚 Juno, which just logged its 50th orbit since 2016.
Europe provided nine of Juice鈥檚 science instruments, with NASA supplying just one.
If Juice confirms underground oceans conducive to past or present life, Witasse said the next step will be to send drills to penetrate the icy crusts and maybe even a submarine.
鈥淲e have to be creative,鈥� he said. 鈥淲e can still think it鈥檚 science fiction, but sometimes the science fiction can join the reality.鈥�
鈥擬arcia Dunn, The Associated Press
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