At first,he thought it was the shadow of one of Jupiter's four big moons.

VOA: special.2009.08.25

In a flash of intuition, he had it: the new stars near Jupiter were actually moons, orbiting the planet as our moon orbits us.

NEWYORKER: Moon Man

It is running out of fuel for its thrusters, and once that has gone its path will be at the whim of the gravitational fields of Jupiter and its moons.

ECONOMIST: Galileo and Jupiter

And new software, plus the ability to vary the projected sizes and brightnesses of planets and moons, makes it possible to simulate the sky from anywhere in the solar system: to see earthrise from Mars, for example, or to watch Jupiter's moons rise and set from a vantage point just above the gas giant's cloud-tops.

ECONOMIST: The joys of indoor star-gazing