Juno originally had a short lifespan, since it was supposed to orbit Jupiter every 14 days. Unfortunately, something went wrong with the valves in its fuel system (and those are necessary for main engine burns), so it got stuck doing 53-day orbits instead of 14-day ones like its ground team planned. Longer orbits mean it needs more time to collect the amount of data NASA wanted to get -- this extension will give the agency the chance to learn everything it can about the biggest planet in our solar system.
Thomas Zurbuchen, associate administrator for NASA's Science Mission Directorate in Washington, said in a statement:
"With these funds, not only can the Juno team continue to answer long-standing questions about Jupiter that first fueled this exciting mission, but they'll also investigate new scientific puzzles motivated by their discoveries thus far. With every additional orbit, both scientists and citizen scientists will help unveil new surprises about this distant world."
In the past two years that it's been orbiting Jupiter, Juno already beamed back a lot of crazy interesting information about the planet. We learned that its poles are packed with storms the size of Earth, for instance, and that the belts we see in many Jupiter photos vary in depth and nature. The spacecraft also took some of the closest images of the planet we've ever seen, including snapshots of the Great Red Spot that show the storm's finer details.