Today NASA will launch a spacecraft that they're hoping will pry the secrets of the solar system from Jupiter. Dubbed "Juno" (Jupiter’s wife in Roman mythology, get it?), the probe will take five years to travel to Jupiter, arriving on July 4, 2016, the New York Times reports. It’ll then spend a year orbiting the planet 33 times, gathering information about Jupiter's gravity, magnetic fields, and the amount of water in the atmosphere—observations that should shed light on the solar system’s early days.
“Jupiter holds the history of the solar system,” explains the mission’s chief investigator. Astronomers are pretty sure the solar system formed when a cloud of hydrogen collapsed to form the sun, spinning out leftover disks of flattened matter that turned into planets. But what were those disks made of? Whatever it was, it’s still sitting inside Jupiter—the massive planet’s gravity is too strong for anything to have escaped.