"The star, found in the Sculptor galaxy 280,000 light-years away, is very low in "metals," astronomers said. In astronomy, metals are any elements other than hydrogen and helium.
Such metal-poor stars are thought to be very old, because metals were rare in the early universe. Elements heavier than helium are produced as a result of star evolution processes, such as nuclear fusion, fission and supernovas."

"This star is likely almost as old as the universe itself," said astronomer Anna Frebel of the Harvard-Smithsonian Center for Astrophysics, lead author of the paper describing the star in Nature this week.
Frebel and her colleagues used high-resolution spectroscopy to probe the star for 11 different chemical elements, and found that its composition is similar to stars found in the Milky Way's "halo."

"The halo stars have metal levels 100,000 times lower than those found in the sun. The star found in the dwarf galaxy, called S1020549, has metal levels 4,000 times lower than the sun, much lower than any other star in a dwarf galaxy."

"The spectroscopic results came from the Magellan-Clay telescope in Las Campanas, Chile.
The finding supports the theory that the halo formed by the Milky Way gobbling up stars from smaller galaxies, the researchers said."

"The original idea that the halo of the Milky Way was formed by destroying a lot of dwarf galaxies does indeed appear to be correct," said Josh Simon, an astronomer at the Observatories of the Carnegie Institution, in a statement.          

Source:cbc news and http://sync.sympatico.ca/News/ContentPosting_CBC?newsitemid=tech-space-metal-poor-star&feedname=CBC-TECH-SCIENCE-V3&show=False&number=0&showbyline=True&subtitle=&detect=&abc=abc&date=True