What's Hot This Week Astronauts Photograph Japan Quake and Tsunami Aftermath from Space By Tariq Malik Astronauts in space have snapped photos from orbit of the effects of the massive earthquake and tsunami that have devastated Japan.     Bizarre Dark Energy Theory Gets Boost From New Measurements By Clara Moskowitz New measurements of the expansion rate of the universe lend new support for the theory of dark energy that suggests a mysterious force is pulling the cosmos apart at ever-increasing speeds.     Sponsored by: When Messenger Arrives in Orbit: Q&A With Sean Solomon, NASA's Mercury Boss Baby Stars Caught Spitting Up High-Speed Jets New Views of Mercury From NASA's Messenger Probe Infographic: How NASA's Stardust Comet Mission Works How the Japan Earthquake Shortened Days on Earth

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