(AP) Soaring over Jupiter's poles, a NASA spacecraft arrived at the solar system's largest planet on a mission to peek behind the cloud tops.
The final leg of the five-year voyage ended Monday when the solar-powered Juno spacecraft fired its main rocket engine and gracefully slipped into orbit around Jupiter.
Mission controllers celebrated when Juno sent back radio signals confirming it reached its destination.
The fifth rock from the sun and the heftiest planet in the solar system, Jupiter is what's known as a gas giant a ball of hydrogen and helium unlike rocky Earth and Mars.
Recent observations by the Hubble Space Telescope revealed the centuries-old monster storm in Jupiter's atmosphere is shrinking.
The trek to Jupiter, spanning nearly five years and 1.8 billion miles (2.8 billion kilometers), took Juno on a tour of the inner solar system followed by a swing past Earth that catapulted it beyond the asteroid belt between Mars and Jupiter.
Plans called for Juno to swoop within 3,000 miles (5,000 kilometers) of Jupiter's clouds closer than previous missions to map the planet's gravity and magnetic fields in order to learn about the interior makeup.