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The oldest stars observed thus far, [10] known as population II, have very low metallicities; [16] [6] as subsequent generations of stars were born, they became more metal-enriched, as the gaseous clouds from which they formed received the metal-rich dust manufactured by previous generations of stars from population III.
The age of the oldest known stars approaches the age of the universe, about 13.8 billion years. Some of these are among the first stars from reionization (the stellar dawn), ending the Dark Ages about 370,000 years after the Big Bang. [1] This list includes stars older than 12 billion years, or about 87% of the age of the universe.
The first generation of stars, known as Population III stars, formed within a few hundred million years after the Big Bang. [57] These stars were the first source of visible light in the universe after recombination. Structures may have begun to emerge from around 150 million years, and early galaxies emerged from around 180 to 700 million years.
Representative lifetimes of stars as a function of their masses The change in size with time of a Sun-like star Artist's depiction of the life cycle of a Sun-like star, starting as a main-sequence star at lower left then expanding through the subgiant and giant phases, until its outer envelope is expelled to form a planetary nebula at upper right Chart of stellar evolution
HE 1523-0901 is the first star whose age was determined using the decay of the radioactive elements uranium and thorium in tandem with measurements of several neutron capture elements. [7] It is believed to have formed directly from the remnants of the first-generation stars that reached the end of their longevity and exploded as supernovae ...
Because it is a Population II star, some suggestions have been raised that second generation star formation may have begun very early on. [7] The oldest-known star (confirmed) – SMSS J031300.36−670839.3, forms. 300 million years: First large-scale astronomical objects, protogalaxies and quasars may have begun forming.
The moment when the first stars in the universe lit up was detected by scientists this week in a revolutionary finding through a faint radio signal.
This allowed them to deduce the time elapsed between the rise of the first generation of stars in the entire Galaxy and the first generation of stars in the cluster. This, added to the estimated age of the stars in the cluster, gives an estimate for the age for the Galaxy: about 13.6 billion years, which is nearly as old as the universe itself ...