Changes

Frebel's team measured the uranium in HE1523-0901 using the UVES spectrograph on the Kueyen Telescope. This is one of four that together comprise the Very Larte Telescope based in Chile. She explained that although uranium had been discovered in two other stars, HE 1523-0901 also contains thorium. Uranium has a half-life of 4.5 billion years while thorium has a half-life of 14 billion years. However, HE 1523-0901 also contains other elements that can be anchored to the radioactive elements - europium, osmium and iridium. This combination provided Frebel with six 'cosmic clocks' that could be used to check each other.

Frebel's team measured the uranium in HE1523-0901 using the UVES spectrograph on the Kueyen Telescope. This is one of four that together comprise the Very Larte Telescope based in Chile. She explained that although uranium had been discovered in two other stars, HE 1523-0901 also contains thorium. Uranium has a half-life of 4.5 billion years while thorium has a half-life of 14 billion years. However, HE 1523-0901 also contains other elements that can be anchored to the radioactive elements - europium, osmium and iridium. This combination provided Frebel with six 'cosmic clocks' that could be used to check each other.

The team hope to gain new experimental data and important clues about the hypothesized creation and evolution of the chemical elements shortly after the Big Bang. <ref> http://www.astronomy.com/asy/default.aspx?c=a&id=5533 </ref>

The team hopes to gain new experimental data and important clues about the hypothesized creation and evolution of the chemical elements shortly after the Big Bang. <ref> http://www.astronomy.com/asy/default.aspx?c=a&id=5533 </ref>

==Number of Stars==

==Number of Stars==