鈥淥ur partners at NASA challenged us, and we learned, grew and ultimately met the moment 鈥� a great accomplishment considering numerous global obstacles,鈥� said Bobby Braun, head of the Space Exploration Sector at APL. 鈥淓uropa Clipper has the potential to uncover incredible secrets of our solar system and place in the universe, and I鈥檓 very proud of the hundreds of APL staff members who worked tirelessly for many years to prepare this hardware for delivery and ultimately launch.鈥�

Slated to take off in 2024, will explore Europa, a moon of Jupiter with an ocean that contains twice as much water as all of Earth鈥檚 oceans combined and that may have the conditions to support life. The spacecraft will observe Europa鈥檚 space environment, surface and interior, helping to determine the thickness of the moon鈥檚 icy crust, the depth and salinity of its ocean, and signs of plumes venting from the ocean into space.

The instruments and flight system components APL delivered play a critical role in achieving those objectives. The team鈥檚 final instrument delivery 鈥� the EIS Narrow-Angle Camera (EIS NAC) 鈥� is scheduled for this fall.

At JPL, over the next two years, engineers and technicians will assemble and test the complete spacecraft, ensuring it can withstand its journey to Jupiter and the harsh space environment at Europa.

Beyond its massive size, Jupiter takes another solar system superlative: the planet with the harshest radiation environment.

Europa Clipper guards against the radiation with metallic shielding to protect instruments and electronics from damage while the spacecraft鈥檚 RadMon keeps constant vigilance of the surrounding environment.

But radiation also has a profound effect on Europa. As Jupiter鈥檚 enormous magnetic field washes over the moon, its interactions with the electrically conductive salty ocean induce a magnetic field around the moon, which Europa Clipper鈥檚 magnetometer will measure to determine Europa鈥檚 ocean depth and conductivity as well as the thickness of its icy shell.

The hot soup of charged particles, or plasma, moving in tow with Jupiter鈥檚 magnetic field at 60 miles (100 kilometers) per second, however, creates its own magnetic fields, distorting Europa鈥檚 induced field and making it hard to interpret.

That鈥檚 where comes in. Using four metal containers called Faraday cups, PIMS will measure the plasma鈥檚 density, temperature and velocity around Europa, which physicists can then use to develop computational models to subtract the plasma鈥檚 effect on Europa鈥檚 magnetic field.

鈥淚t sounds simple, but it鈥檚 anything but that, and the interpretation of the data is going to be complex,鈥� said , a chief scientist for space physics at APL and principal investigator for PIMS. 鈥淏ut because our instrument is going to be so sensitive to these small currents, we are going to have such a cleaner and clearer picture of Europa鈥檚 subsurface ocean than ever before.鈥�

PIMS鈥檚 Faraday cups were specially designed to deal with Jupiter鈥檚 radiation environment. At about 8 inches (20 centimeters) wide and 3 inches (8 centimeters) deep, each cup was designed like a little stadium, with tiers of progressively smaller metal rings and insulating spacers that lead to a flat detector plate at the bottom.

鈥淚t鈥檚 a design that is very different from the way it鈥檚 ever been done in the past,鈥� said Matthew Grey, an electrical engineer at APL and the former lead instrument engineer for PIMS. It also ensures plasma particles have no direct way to hit materials behind the tiered rings, which would otherwise capture and bleed off the charge to other parts or instruments.

The WAC 鈥� one of two cameras in the spacecraft鈥檚 鈥� has one of the largest sensors to be flown in deep space: an 8-megapixel sensor that can capture color and stereoscopic images as good as about 23-feet (7-meter) per-pixel resolution.

A refractive telescope, the WAC captures light directly, passing it through a series of lenses built to withstand Jupiter鈥檚 radiation and focusing the light on a metal-oxide semiconductor like those found in cell phones and digital cameras. The camera will capture wide swaths of Europa鈥檚 landscape on every flyby, providing new information about materials and geologic features on the surface.

Although multiple missions have already imaged Europa, they鈥檝e captured only about 15% of its surface at even moderate resolution, and very little of it in color or stereo, said APL planetary scientist , EIS鈥檚 principal investigator.

In combination with its narrow-angle counterpart, the WAC will image roughly 90% of Europa鈥檚 surface at better than 330 feet (100 meters) per pixel, providing an unprecedented global data set of Europa鈥檚 geology.

Using those images, scientists will determine what geologic processes acting in the ice shell might have created (or continue to create) Europa鈥檚 many surface features.

鈥淲e can use these images to understand the individual landforms and relationships between different landforms, and the better we understand the landforms, the better we can put constraints on the structure of the interior,鈥� Turtle explained.

In coordination with the mission鈥檚 radar team, the camera will help scientists interpret structures beneath the surface and search for fresh deposits from Europa鈥檚 purported water vapor plumes, which, if found, would reveal an ongoing exchange between the subsurface water and the icy surface. Finally, the WAC will help identify ideal landing sites for a potential future lander mission.

APL is a partner in the development of NASA鈥檚 Europa Clipper, which JPL leads for NASA鈥檚 Science Mission Directorate in Washington. The mission is managed by Caltech in Pasadena, California. The Planetary Missions Program Office at NASA鈥檚 Marshall Space Flight Center in Huntsville, Alabama, executes program management of the Europa Clipper mission.

Learn more about Europa and Europa Clipper .