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The reference frames of Mercury after the MESSENGER mission
We report on recent refinements and the current status for the rotational state models and the reference frames of the planet Mercury. We summarize...
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Famous Springs and Bottled Waters
Grandmother used to think of bottled water as a heating pad to keep her feet warm on a cold night. Today, few Americans would have trouble relating... -
Mercury
The innermost planet of the solar system, Mercury, was known to the Sumerians about 2500 BC, and to the Egyptians it was known as Sebegu (Strouhal,... -
Das Relief des Mars' Versuch einer zusammenfassenden Übersicht
Since some years the relief of the martian lowlands is interpreted as remnant of a fossil (mud) ocean which got frozen and/or desiccated. Its relief...
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Africa
Algeria has been a source of salt for thousands of years. The salt lake at Ourargla which was eight days by camel south of Biskra is said to have...