HE 1523-0901: Oldest Star (Fact of the Day)

Artist's impression of the star
HE 1523-0901 is the oldest star known yet. It is about 7,500 light years away in our Milky Way Galaxy. It is approximately 0.8 solar masses. The star's age is measured to be 13.2 billion years compared to the 13.7 billion years which is the age of the Universe. It is thought that the star would be a second generation star as it is metal poor. This means that this star formed from the remnants of the first generation stars. It is also the first star whose age is determined using the radioactive decay of uranium and thorium along with the measurements of three neutron capture elements: europium, osmium and iridium.


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