What's Hot This Week New Physics? Fundamental Cosmic Constant Now Seems Shifty By Clara Moskowitz A fundamental constant of the universe may not be so constant after all, according to a new study.     Sun Unleashes Impressive Solar Flare By Tariq Malik The sun has unleashed a massive solar eruption, but it's not expected to reach Earth, NASA scientists say.     Sponsored by: Railway to the Sky? NASA Ponders New Launch System Elusive Mercury Visible at Dawn This Week NASA Selects Astronaut Crew for Possible Extra Shuttle Flight Black Holes of the Universe Halley's Comet Was Spotted By Ancient Greeks

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