Europe's flagship Jupiter probe finally managed to fix its antenna problem.
The Jupiter Icy Moons Explorer, or JUICE, just deployed its Radar for Icy Moons Exploration (RIME) antenna after more than three weeks of intense troubleshooting efforts, European Space Agency (ESA) officials announced today (May 12).
That success is a big deal, because RIME is a key piece of JUICE's scientific package.
Once the probe arrives in the Jupiter system in July 2031, "it will use RIME to study the surface and subsurface structure of Jupiter's icy moons down to a depth of 9 km [5.6 miles]," ESA officials wrote in an update today. "RIME is one of 10 instruments on board JUICE set to investigate the emergence of habitable worlds around gas giants and the formation of our solar system."
Related: Europe successfully launches JUICE to study Jupiter's icy moons
The $1.1 billion (870 million euros) JUICE mission launched on April 14. Everything went well initially, except for the planned deployment of the RIME antenna: The instrument's 52-foot-long (16 m) boom got stuck.
The mission team suspected that a stuck pin was jamming the segments of the folded-up RIME antenna. They tried a number to tricks to jostle the pin loose — shaking JUICE using its thrusters, for example, and orienting the probe to be warmed by sunlight.
These techniques showed some promise, moving the pin a bit. But success didn't come until today, "when the flight control team fired a mechanical device called a 'non-explosive actuator' (NEA), located in the jammed bracket," ESA officials wrote in the update.
"This delivered a shock that moved the pin by a matter of millimeters and allowed the antenna to unfold," they added.
After arriving in orbit around Jupiter, JUICE will study the moons Ganymede, Callisto and Europa up close during a series of flybys. All three of these moons are thought to harbor oceans of liquid water beneath their icy shells.
If all goes according to plan, JUICE will enter orbit around the 3,270-mile-wide (5,260 km) Ganymede, the largest moon in the solar system, in December 2034. This will be a historic moment: No spacecraft has ever orbited a moon of a planet beyond Earth.
Mike Wall is the author of "Out There" (Grand Central Publishing, 2018; illustrated by Karl Tate), a book about the search for alien life. Follow him on Twitter @michaeldwall. Follow us on Twitter @Spacedotcom or Facebook.