Regina

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Leno on Robin Williams: 'I lost a friend'

Even after spending 22 years as the loquacious host of "The Tonight Show," always ready with witty remark or humorous barb, Jay Leno admits he's at a loss for words when it comes to talking about his friend, Robin Williams.<p>Williams was battling depression and the early stages of Parkinson's Disease …

NASA Spacecraft Just One Year Away from Pluto

Less than a year from now, NASA's New Horizons spacecraft will make the first-ever visit to Pluto, potentially revolutionizing scientists' …

Solar System

Perseus Cluster Mystery Persists --"What We Found Could Not be Explained by Known Physics"

"The cluster's atmosphere is full of ions such as Fe XXV, Si XIV, and S XV. Each one produces a 'bump' or 'line' in the x-ray spectrum, which we can …

Pictures: Extreme Sun and Stars

More than 200 billion stars fill the Milky Way galaxy and several hundred billion galaxies swirl in the universe. Our telescopes and supercomputers capture them in all their glory.