NASA's Juno is about to reach Jupiter after a 5-year journey. I visited JPL before the big show.

Today is a big day for NASA. At 8:18pm Pacific, the Juno spacecraft headed for Jupiter will fire off its main thrusters and, if all goes well, begin orbiting the gas giant. It's a make-it-or-break-it moment and thousands of eyes will be watching the live event.

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