The brightest star in the sky is Sirius, and it is bluish-white in colour. Which is the brightest star in the universe, and what is its colour?Īnswer. According to the Inverse Square Law of brightness, the perceived brightness (B) of the source is inversely proportional to the square of the distance of source (d). As light rays originate from the body, they disperse out into the field. The apparent brightness of the source is the result of geometry. By definition, SNe Ia lack signs of hydrogen in the ejecta, but should the explosion occur in a hydrogen-rich medium that. We discuss possible origins for the observed hydrogen. Dark matter makes up 30.1 percent of the matter -energy composition of the universe the rest is dark energy (69.4 percent) and ordinary visible matter (0.5 percent). By contrast, ASASSN-18tb is a sub-luminous SN Ia (M B,max 17.7 mag) found in an early-type galaxy dominated by old stellar populations. The distance between the star, and the earth. dark matter, a component of the universe whose presence is discerned from its gravitational attraction rather than its luminosity.The brightness of a star that appears to our naked eyes depends primarily on two factors: If two stars of equal size are with various temperatures, then the star with higher temperature will be more luminous, than the star with lower temperature. The larger the star is, the more energy it emits, and the more luminous it is. In general, luminosity depends on two factors: 2 FAQs about Luminosity Factors of Luminosity
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