Monthly Archives: November 2012

Hurtling moon casts no cooling shadow

Total solar eclipses on Earth take hours to unfold, even if totality — the brief time when all the Sun is covered — lasts just a few minutes. Almost everyone who stands in the path of a solar eclipse notes … Continue reading

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Salty flows on Mars

The features known as “recurring slope lineae” (RSL) are the best evidence going that liquid water can, and does, flow on present-day Mars. The lineae are small dark streaks that appear mostly on equator-facing slopes, are associated with slope channels, … Continue reading

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When did the Martian dynamo die?

Current thinking among Mars scientists holds that the Red Planet’s dynamo — the geo-engine in its molten core which generates a global magnetic field — was active soon after the planet formed, but turned off about 4 billion years ago. … Continue reading

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