The US space agency's Juno mission to solve the mystery of what lies beneath the swirling storm clouds of Jupiter has sent back its first imagery since going into orbit. Nasa on Tuesday released a picture taken by the spacecraft of the huge gas giant, showing a sunlit section of the planet along with three of its moons - Io, Europa and Ganymede.The fourth major satellite, Callisto, is invisible.The image was taken when the Juno spacecraft was circling 4.8million kilometres away. Even at that distance, Jupiter's Great Red Spot - the storm that has raged on the planet for hundreds of years - was clearly visible.Juno entered orbit around Jupiter last week after a five-year journey. It is on a 20-month mission to map the giant planet's poles, atmosphere and interior.The mission hopes to learn more about the spectacular auroras at the Jovian poles.The Juno spacecraft is packed with nine instruments capable of peering into the planet's heart.During the approach, the camera and instruments were powered off as a precaution as Juno braved intense radiation.The instruments were turned back on several days after the arrival and scientists will be relieved that "JunoCam" is working despite the harsh environment.Juno is moving away from Jupiter on an arc, but will sweep back in next month, enabling the camera to take close-up images.Nasa said the mission team was now turning on all the probe's instruments before work to study Jupiter begins in October.It is expected that midway through October Juno will be put in a 14-day orbit around the planet - before at least 30 revolutions, with many passes, getting under 5000km from its clouds.The goal of the mission is to learn more about Jupiter, which is so big it can be seen from Earth without a telescope and which produces the most spectacular auroras in the solar system.Scientists are not even sure if there is a solid core beneath its turbulent atmosphere or what drives the enormous magnetic field that surrounds the planet.Nasa's Juno spacecraft will orbit Jupiter for a year.Once the mission is over Juno will dive into Jupiter's atmosphere and burn up to avoid accidentally crashing onto one of the planet's moons. ..