The Great Red Spot is a gargantuan, high-pressure vortex called an anticyclonic storm that has been raging in Jupiter's southern hemisphere for at least 350 years. The storm's physical width has varied in roughly 150 years of observation, but it's believed to be more than 10,000 miles wide – more than enough to contain the entirety of Earth.

After a 1.8 billion-mile journey, the uncrewed spacecraft is expected to settle into orbit around Jupiter in 2030, in an endeavor to find out if the moon, Europa, is habitable.

Mission to Europa marks the first dedicated exploration of an extraterrestrial ocean world that scientists believe may have the right combination of water, energy and organic compounds to harbor life.