It's a real-life close encounter, and all you have to do is look up.
. They serve as a constant delight to amateur astronomers and can be seen in any telescope and even binoculars. They orbit Jupiter so quickly that they change their appearance from hour to hour and night to night.
Then on Monday at 2:15 a.m. EDT , Io will fade away as it becomes eclipsed by Jupiter's shadow. Shortly thereafter Io will pass behind Jupiter, but will emerge back into view a little over three hours later. Those in the central and western states, where the sky will still be dark, will then be able to see all four moons aligned on one side of Jupiter.
The moon, of course, far outshines Jupiter by more than 9 magnitudes; a brightness ratio of 4,370 to 1.
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