2009 August 1
Saturday, August 1st, 2009A new star, likely the brightest supernovain recorded human history, lit upplanet Earth’s sky in the year 1006 AD.The expanding debris cloud from the stellar explosion,found in the southerly constellationofLupus,still puts on a cosmic light show across theelectromagnetic spectrum.In fact, thiscomposite view includesX-ray data in blue from theChandra Observatory,optical data inyellowish hues, and radio image data in red.Now known as the SN 1006supernova remnant, the debris cloudappears to be about 60 light-years across and is understoodto represent the remains of a white dwarf star.Part of a binary star system,the compact white dwarf graduallycaptured material from its companion star.The buildup in mass finally triggered athermonuclearexplosion that destroyed the dwarf star.Because the distance to the supernova remnant is about 7,000light-years, that explosion actuallyhappened 7,000 years before the light reached Earth in 1006.Shockwaves in the remnantaccelerateparticles to extreme energies and arethought to be a source of the mysteriouscosmic rays
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The checkout and calibration of the NASA/ESA Hubble Space Telescope has been interrupted to aim the recently refurbished observatory at a new expanding spot on the giant planet Jupiter. The spot, caused by the impact of a comet or an asteroid, is changing from day to day in the planet’s cloud tops. 

