These new views include the closest look yet at the Earth-sized "Little Red Spot" storm churning materials through Jupiter's cloud tops; detailed images of small satellites herding dust and boulders through Jupiter's faint rings; and of volcanic eruptions and circular grooves on the planet's largest moons.

New Horizons came to within 1.4 million miles of Jupiter on Feb. 28, using the planet's gravity to trim three years from its travel time to Pluto. For several weeks before and after this closest approach, the piano-sized robotic probe trained its seven cameras and sensors on Jupiter and its four largest moons, storing data from nearly 700 observations on its digital recorders and gradually sending that information back to Earth. About 70 percent of the expected 34 gigabits of data has come back so far, radioed to NASA's largest antennas over more than 600 million miles. This activity confirmed the successful testing of the instruments and operating software the spacecraft will use at Pluto.

"Aside from setting up our 2015 arrival at Pluto, the Jupiter flyby was a stress test of our spacecraft and team, and both passed with very high marks," said Science Mission Directorate Associate Administrator and New Horizons Principal Investigator Alan Stern, NASA Headquarters, Washington. "We'll be analyzing this data for months to come; we have collected spectacular scientific products as well as evocative images."

Images include the first close-up scans of the Little Red Spot, Jupiter's second-largest storm, which formed when three smaller storms merged during the past decade. The storm, about half the size of Jupiter's larger Great Red Spot and about 70 percent of Earth's diameter, began turning red about a year before New Horizons flew past it. Scientists will search for clues about how these systems form and why they change colors in their close observations of materials spinning within and around the nascent storm.

"This is our best look ever of a storm like this in its infancy," said Hal Weaver, New Horizons project scientist from the Johns Hopkins University Applied Physics Laboratory (APL), Laurel, Md. APL built and operates the New Horizons spacecraft. "Combined with data from telescopes on and around Earth taken at the same time New Horizons sped past Jupiter, we're getting an incredible look at the dynamics of weather on giant planets."

Under a range of lighting and viewing angles, New Horizons also grabbed the clearest images ever of the tenuous Jovian ring system. In them, scientists spotted a series of unexpected arcs and clumps of dust, indicative of a recent impact into the ring by a small object. Movies made from New Horizons images also provide an unprecedented look at ring dynamics, with the tiny inner moons Metis and Adrastea appearing to shepherd the materials around the rings.

"We're starting to see that rings can evolve rapidly, with changes detectable during weeks and months," said Jeff Moore, New Horizons Jupiter Encounter science team lead from NASA Ames Research Center, Moffett Field, Calif. "We've seen similar phenomena in the rings of Saturn."

Of Jupiter's four largest moons, the team focused much attention on volcanic Io, the most geologically active body in the solar system. New Horizons' cameras captured pockets of bright, glowing lava scattered across the surface; dozens of small, glowing spots of gas; and several fortuitous views of a sunlit umbrella-shaped dust plume rising 200 miles into space from the volcano Tvashtar, the best images yet of a giant eruption from the tortured volcanic moon.

The timing and location of the spacecraft's trajectory also allowed it to spy many of the mysterious, circular troughs carved onto the icy moon Europa. Data on the size, depth and distribution of these troughs, discovered by the Jupiter-orbiting Galileo mission, will help scientists determine the thickness of the ice shell that covers Europa's global ocean.

Already the fastest spacecraft ever launched, New Horizons reached Jupiter 13 months after lifting off from Cape Canaveral Air Force Station, Fla., in January 2006. The flyby added 9,000 miles per hour, pushing New Horizons past 50,000 miles per hour and setting up a flight by Pluto in July 2015.

The number of observations at Jupiter was twice that of those planned at Pluto. New Horizons made most of these observations during the spacecraft's closest approach to the planet, which was guided by more than 40,000 separate commands in the onboard computer.

"We can run simulations and take test images of stars, and learn that things would probably work fine at Pluto," said John Spencer, deputy lead of the New Horizons Jupiter Encounter Science Team, Southwest Research Institute, Boulder, Colo. "But having a planet to look at and lots of data to dig into tells us that the spacecraft and team can do all these amazing things. We might not have explored the full capabilities of the spacecraft if we didn't have this real planetary flyby to push the system and get our imaginations going."

More data are to come, as New Horizons completes its unprecedented flight down Jupiter's long magnetotail, where it will analyze the intensities of sun-charged particles that flow hundreds of millions of miles beyond the giant planet.

New Horizons is the first mission in NASA's New Frontiers Program of medium-class spacecraft exploration projects. Stern leads the mission and science team as principal investigator; APL manages the mission for NASA's Science Mission Directorate. The mission team also includes Ball Aerospace Corp., Boulder, Colo; the Boeing Company, Chicago; NASA's Goddard Space Flight Center, Greenbelt, Md.;NASA's Jet Propulsion Laboratory, Pasadena, Calif.; Stanford University, Palo Alto, Calif.; KinetX, Inc., Simi Valley, Calif.; Lockheed Martin Corp.; Denver; University of Colorado, Boulder; the U.S. Department of Energy, Washington; and a number of other firms, NASA centers, and university partners.

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