This artist's rendering provided by NASA and JPL-Caltech shows the Juno spacecraft above the planet Jupiter. 
Photo: NASA / JPL-Caltech
Photo: NASA / JPL-Caltech

'Welcome to Jupiter': NASA's Juno orbiting 'king of planets' after 5-year journey

Most people looking up at the sky Monday night were enjoying fireworks, but NASA scientists were hoping for an entirely different display for the Fourth of July.

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About 11:53 p.m. ET, NASA’s Juno probe entered Jupiter's orbit after a five-year journey.

"Juno, welcome to Jupiter," said mission control commentator Jennifer Delavan of Lockheed Martin, which built Juno.

It took more than 2 billion miles of flying, but Juno is expected to send back the best photos of Jupiter we've ever seen.

It's not just a sightseeing mission for Juno. It's aiming to get details about Jupiter's composition, which should help scientists figure out how it was formed. That is, if the spacecraft survives.

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All of Juno's sensitive scientific equipment is encased in a 400-pound titanium vault to defend against Jupiter’s magnetic field, but little bits of rock or dust could still do a lot of damage to a craft traveling 130,000 mph. 

If the mission goes smoothly, Juno will give researchers the first close look at what's going on beneath Jupiter's clouds. Scientists are hopeful it will shed light on how other planets developed.

Since Jupiter is made of gas, Juno can't land, so the orbiter will have to take its measurements from a distance. It will continue orbiting the gas giant until it's scheduled to run into Jupiter's clouds and be incinerated in 2018.

This video includes clips from NASA. Music provided courtesy of APM Music.

– The Associated Press contributed to this report.

>> Click here or scroll down to see what NASA was saying on social media

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