Planets

The Elusive Moons of Uranus

Take the observing challenge: Find as many as five of the brightest moons of Uranus in a large backyard telescope using our interactive observing tool.

Night Sky Sights

The Martian Moons in 2007–08

If you've never spied Mars's two satellites, Phobos and Deimos, the end of 2007 is your best chance for a long time. You'll need a big telescope — and you'll need to know exactly where to look.

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