Meet the 'zombie star' that survived a supernova blast

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Astronomers have observed in a relatively nearby galaxy a star that not only survived what ordinarily should have been certain death - a stellar explosion called a supernova - but emerged from it brighter than before the blast.

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The star at issue, observed with the Hubble Space Telescope, is a kind known as a white dwarf, an incredibly dense object with about the mass of the sun crammed into the size of Earth. A white dwarf is the remaining core of a star that blew off a lot of its material at the end of its life cycle, as our sun is expected to do about 5 billion years from now.

"We were quite surprised that the star itself had not been destroyed but had actually survived and is brighter than before it exploded," said Curtis McCully, a senior astrodata scientist at California-based Las Cumbres Observatory, lead author of the research published this month in the"During the explosion, radioactive material was produced. This is what powers the brightness of the supernova.

There are various types of supernovae depending on the size and composition of the star and the power of the blast.

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