What You Need To Know About NASA's Juno Spacecraft
It's crunch time for Juno, which is due to be captured in Jupiter's orbit in the early hours of Tuesday morning.
Juno's mission is to study Jupiter, the largest planet in our solar system.
The spacecraft set off from Earth in August 2011 and will have travelled 1,740 million miles by the time it reaches orbit around Jupiter.
Once Juno is in orbit it will stay there for 20 months, flying round the gas giant 37 times in total.
Scientists hope to find out how Jupiter formed and what's at its core, among other things.
You can follow events live with NASA TV from 3:30am UK time on Tuesday. 🚀
Keep up with the latest daily buzz with the BuzzFeed Daily newsletter!