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  2. Stellar population - Wikipedia

    en.wikipedia.org/wiki/Stellar_population

    By definition, each population group shows the trend where lower metal content indicates higher age of stars. Hence, the first stars in the universe (very low metal content) were deemed population III, old stars (low metallicity) as population II, and recent stars (high metallicity) as population I. [6] The Sun is considered population I, a ...

  3. SDSS J001820.5−093939.2 - Wikipedia

    en.wikipedia.org/wiki/SDSS_J001820.5%E2%88...

    This means that SDSS J0018−0939 most likely preserved the elemental abundance ratios produced by a first-generation very-massive star. [7] First generation stars are expected to self-regulate their growth by radiative feedback in the formation process, and to achieve masses typically tens of times that of the Sun. A fraction of stars might ...

  4. HE 1327-2326 - Wikipedia

    en.wikipedia.org/wiki/HE_1327-2326

    HE 1327-2326, discovered in 2005 by Anna Frebel and collaborators, [2] was the star with the lowest known iron abundance until SMSS J031300.36−670839.3 was discovered. [5] The star is a member of Population II stars , with a solar-standardised iron to hydrogen index [Fe/H], or metallicity , of −5.4±0.2.

  5. Lists of stars - Wikipedia

    en.wikipedia.org/wiki/Lists_of_stars

    The following is a list of particularly notable actual or hypothetical stars that have their own articles in Wikipedia, but are not included in the lists above. BPM 37093 — a diamond star Cygnus X-1 — X-ray source

  6. Timeline of the early universe - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_the_early_universe

    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.

  7. Stellar evolution - Wikipedia

    en.wikipedia.org/wiki/Stellar_evolution

    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

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  9. Cosmos Redshift 7 - Wikipedia

    en.wikipedia.org/wiki/Cosmos_Redshift_7

    Cosmos Redshift 7 (also known as COSMOS Redshift 7, Galaxy Cosmos Redshift 7, Galaxy CR7 or CR7) is a high-redshift Lyman-alpha emitter galaxy.At a redshift z = 6.6, [1] the galaxy is observed as it was about 800 million years after the Big Bang, during the epoch of reionisation. [1]