Juno was slated to complete 34 orbits of Jupiter. It’s now on orbit 47.
Juno has also passed by some of the planet’s moons, flying by Ganymede in 2021. Ganymede “is bathed by Jupiter’s magnetic field,” and Juno was able to observe, among other things, a tug of war of magnetic field lines between the planet and its moon, said space physicist Thomas Greathouse, also of the Southwest Research Institute.
In September, Juno flew by Jupiter’s moon Europa, capturing in new detail the chaotic crisscrosses of cracks, ridges and bands in the moon’s icy surface. Now the spacecraft is on its way toward Io, the innermost moon. While Juno seems to be going strong, “the end could come in two different ways,” Bolton said. Juno could become too degraded by the intense radiation to function — or it could simply run out of propellant, which is needed to keep its antennas pointed toward Earth. If that happens, “it could be collecting data, but can’t send it back.”
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