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The appearance of Saturn
The Real Lord of the Rings

Why is Saturn the only planet with bright, easily seen rings? Saturn is not the only planet in our solar system with rings. Jupiter, Neptune and Uranus all have rings. Jupiter's rings are much smaller ...
24 GPS satellites orbit Earth.
Tick-Tock Atomic Clock

Modern navigators rely on atomic clocks. Instead of old-style springs or pendulums, the natural resonances of atoms -- usually cesium or rubidium -- provide the steady 'tick' of an atomic clock. The b ...
This image shows the comet Wild 2, which NASA
NASA Spacecraft Reveals Surprising Anatomy Of A Comet

Findings from a historic encounter between NASA's Stardust spacecraft and a comet have revealed a much stranger world than previously believed. The comet's rigid surface, dotted with towering pinnacle ...

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