NASA has launched a high-resolution picture taken by the deep area probe Juno throughout its encounter with Jupiter’s moon Io on December 30, 2023. The picture from the volcanic satellite tv for pc exhibits not solely outstanding element, but in addition a standard kind of illumination.
When the robotic Juno orbiter zoomed previous Io in December, it was the closest flyby of the moon because the Galileo mission greater than twenty years in the past. It additionally marked a generational leap in photographic capabilities because of the JunoCam, which might handle a decision of 15 km/pixel (9.3 miles/pixel) from 4,300 km (2,700 miles).
As Juno handed over Io’s southern hemisphere, JunoCam despatched again high-resolution photographs of many options of the moon, together with lively volcanoes spewing sulfur clouds into area.
Nevertheless, the final edited picture exhibits a wierd phenomenon. We’re used to seeing objects in area which might be brightly lit by the solar on one aspect and sit in pitch-black darkness on the opposite. The brand new picture exhibits one aspect of Io brightly lit, however the evening aspect is nearly as brilliant. It is because the intense aspect is illuminated by the Solar, whereas the opposite aspect is illuminated by “Juptershine” – that’s, daylight mirrored from Jupiter again at Io.
You’ll be able to see one thing related throughout a New Moon. Though the moon needs to be in full darkness, it’s really very dimly illuminated by Earth’s gentle. When the moon is new, the moon sees a full Earth, which displays a variety of daylight – sufficient to be seen on Earth beneath the correct circumstances.
Since Jupiter is eleven occasions the diameter of Earth, Io naturally receives virtually as a lot gentle from it because it does from the Solar.