Europa Clipper: NASA's Mission to a Hidden Ocean World

Beneath Europa's icy shell, more water flows than in all of Earth's oceans combined. Europa Clipper is the spacecraft NASA built to study that ocean from above — to characterize its chemistry, the thickness of the ice, and whether the conditions for life exist there today.

Why not orbit Europa?

Jupiter's radiation belts would destroy a Europa orbiter's electronics within weeks. Clipper instead orbits Jupiter on a long looping path and makes 49 close flybys of Europa — diving in, gathering data, and dashing out before radiation damage accumulates.

Launch vehicle

SpaceX Falcon Heavy (October 2024)

Arrival at Jupiter

2030

Mass

6,065 kg (largest interplanetary spacecraft NASA has built)

Solar arrays

30 m wingspan — solar power at 5 AU

Flybys of Europa

49 planned

Closest approach

As low as 25 km above the ice

The science instruments

• Ice-penetrating radar to image the structure of the shell down to the ocean.
• Magnetometer to measure the induced magnetic field and confirm the salty ocean depth.
• Mass spectrometers to taste any plumes erupting through the ice.
• High-resolution cameras and spectrometers to map composition and geology.
• Thermal instrument to find recently active warm spots on the surface.

What counts as a habitable world?

Astrobiologists look for three things: liquid water, the chemistry needed by life, and an energy source. Europa likely has all three — water from the ocean, organic chemistry from cometary delivery, and energy from tidal heating and possible hydrothermal vents on the seafloor.

How long will the mission last?

The prime mission lasts about four years at Jupiter, with potential extension. Each Europa flyby returns more data than the entire Galileo mission collected from the moon in the 1990s.