L, where f is the fraction of the total mass of the star, M, available for nuclear burning in the core and L Since stars have a limited supply of hydrogen in their cores, they have a limited Other hand, Proxima Centauri, our nearest neighbor, is less massive than the Sun, and is The constellation Orion, is more massive than the Sun, and is noticeably bluer. For example, Sirius, the dog star, located to the lower left of ![]() The more massive a main sequence star, theīrighter and bluer it is. Ten times brighter than a star half its mass. However, we should not be too embarrassed by the Sun's low luminosity: it is Stars that are ten times more massive than the Sun are over a thousand times more luminous Luminosity, the total energy radiated by the star per unit time, depends only on its mass. For a given chemical composition and stellar age, a stars' Main sequence stars are stars, like our Sun, that fuse hydrogen atoms together to make To the HST press release describing this image Main Sequence Stars Once the starĬontracts enough that its central core can burn hydrogen to helium, it becomes a ![]() Gravitational energy of the collapsing star is the source of its energy. ![]() Regions in the clouds collapse and form "protostars". Spiral arms of galaxies are the birthplace of stars. The Life and Death of Stars Where are Stars Born?Īstronomers believe that molecular clouds, dense clouds of gas located primarily in the
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