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NASA astronomers unravel secret of the supernova

Last Updated: Friday, February 19, 2010, 15:44

Supernovas have long been used as "cosmic mile markers" to measure the expansion of the universe, but NASA scientists now claim that they have finally discovered what actually sparks the massive stellar explosions.

Astronomers find oldest stars outside Milky Way

Last Updated: Thursday, February 18, 2010, 08:37

European Southern Observatory astronomers have said they had uncovered the oldest stars in our galactic neighborhood thanks to a massive telescope installed in Chile.