Destination Jupiter: What to expect during the Juno mission

LOS ANGELES -- Now that the Juno spacecraft is settled in orbit around Jupiter, the real work is about to begin.

Juno will fly closer to Jupiter than any other spacecraft, skipping over cloud tops and peering deep inside to uncover clues about the giant planet's formation. Scientists hope understanding how Jupiter formed can help explain how Earth and other planets evolved as well.

"Now the fun begins -- the science," mission chief scientist Scott Bolton said after Juno's arrival Monday at the end of a five-year journey.

A look at what's coming up during the $1.1 billion mission:

Post-trip checkup

Juno was bombarded with radiation as it neared Jupiter, the largest planet in the solar system.

As a precaution, its camera and science instruments were turned off during the arrival. Engineers will flip them back on this week and perform a complete check of the spacecraft to make sure everything is ready to go for the next 20 months.

Changing course

To enter Jupiter's orbit, Juno fired its rocket motor, putting it on a long, looping path that takes 53 days to complete. In late August, the spacecraft will swing back around Jupiter for its first close-in view.

Juno eventually needs to swoop in closer to do its job. The mission kicks into high gear in October when Juno fires its engine again to tighten its orbit. Then every two weeks, the spacecraft will skim Jupiter's clouds to peek into its atmosphere.

Moon mystery

Juno made a discovery even before reaching its destination.

As Juno zeroed in on Jupiter, its camera captured the planet appearing half-lit, surrounded by its four main moons. NASA stitched the images together and created a time-lapse video showing the moons in action.

There was a surprise: Jupiter's second-largest moon, Callisto, appeared dimmer than scientists imagined.

Closest look

Previous missions to Jupiter have revealed stunning views of the planet's thick clouds and vivid auroras. Scientists are expecting the best photos and information yet from Juno.

The spacecraft carries nine instruments to map the planet. It will measure how much water is in Jupiter's atmosphere. This will shed light on where in the solar system Jupiter formed.

It will probe Jupiter's gravity and magnetic fields to determine what kind of core it has and what makes the northern and southern lights so intense. Juno also will study how deep the Great Red Spot goes and why the centuries-old storm has shrunk in recent years.

Finale

When Juno finishes, it will plunge into Jupiter's atmosphere and burn up. Galileo, the first spacecraft to orbit Jupiter, met the same fate after a 14-year mission.