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Stellar population
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===Population I stars=== {{anchor|Population I stars}} [[File:Treasures3.jpg|thumb|right|Population I star [[Rigel]] with [[reflection nebula]] [[IC 2118]]]] Population I stars are young stars with the highest metallicity out of all three populations and are more commonly found in the [[spiral arm]]s of the [[Milky Way]] galaxy. The [[Sun]] is considered as an intermediate population I star, while the sun-like [[Mu Arae|{{mvar|ΞΌ}} Arae]] is much richer in metals.<ref name=Soriano-Vauclair-2009/> (The term ''metal-rich'' is used to describe stars with a significantly higher metallicity than the Sun; higher than can be explained by measurement error.) Population I stars usually have regular [[elliptical orbit]]s of the [[Galactic Center]], with a low [[relative velocity]]. It was earlier hypothesized that the high metallicity of population I stars makes them more likely to possess [[planetary system]]s than the other two populations, because [[planet]]s, particularly [[terrestrial planet]]s, are thought to be formed by the [[accretion (astrophysics)|accretion]] of metals.<ref name=Lineweaver-2000/> However, observations of the [[Kepler Space Telescope]] data have found smaller planets around stars with a range of metallicities, while only larger, potential gas giant planets are concentrated around stars with relatively higher metallicity β a finding that has implications for theories of gas-giant formation.<ref name=Buchhave-etal-2012/> Between the intermediate population I and the population II stars comes the intermediate disc population.
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