Brightness is defined as the luminousity as seen from Earth. So the brightest star is the Sun.
HD 93129A is a blue supergiant and one of the most luminous stars in the Milky Way and is 5,500,000 times more luminous than the Sun.
Good, a nice question with a definite answer. The magnitude1 star is 2.512 times brighter (near enough).
Contenders are:- LBV 1806-20 - ~ 5,000,000 times brighter than the Sun. Pistol Star - ~ 1,000,000 times brighter than the Sun (Variable) Cygnus OB2-12 ~ 6,000,000 times brighter than the Sun HD 93129A ~ 5,500,000 times brighter than the Sun. Eta Carnae ~ 5,000,000 times brighter than the Sun.
Absolutely. When speaking of the brightness you see from earth, you are speaking of apparent magnitude. When considering the type of star, it's composition, stage, age, size, distance, etc., a star is also assigned an absolute magnitude, so the ranking of the star if seen from similar distances reveals the truth about a star. 3.26 light years away is the assumed distance in ranking stars. A star many times farther away than a second star may appear much brighter than the second star which is much closer, based partially on the various factors mentioned above. The lower the value for a magnitude, the brighter, or more correctly, the more luminous, a star. Thus, a 3.4 is brighter than a 5.1, for example. Long ago the scale was originally an arbitrary ranking based on certain stars that were considered to be the brightest. Since then, stars even brighter have been identified, thus the need to use values even less than zero. Only a handful of stars fall below zero in apparent magnitude. So then it is not significant where in the sky (in what constellation) a star lies, the magnitude value determines the brightness.
A supernova can be billions of times brighter than a nova. Novas occur on the surfaces of white dwarf stars and release energy comparable to millions of hydrogen bombs, while supernovae represent the explosion of an entire star and can briefly outshine entire galaxies.
Sirius appears brighter than Pollux because it is closer to Earth and is a more luminous star. Sirius is also a hot, blue star compared to Pollux, which is a cooler, orange giant star, further contributing to the difference in brightness.
a Supergiant
super-giant star
A nova or supernova.
It is four times as brighter. It is four times as brighter.
In absolute terms, some are brighter than our Sun - in some rare cases, millions of times brighter - while others are much less bright than our Sun.
A magnitude 1 star is 100 times brighter than a magnitude 6 star.A magnitude 1 star is 100 times brighter than a magnitude 6 star.A magnitude 1 star is 100 times brighter than a magnitude 6 star.A magnitude 1 star is 100 times brighter than a magnitude 6 star.
2 magnitudes brighter means it's about 2.512 x 2.512 times brighter. So that's about 6.31 times brighter.
Good, a nice question with a definite answer. The magnitude1 star is 2.512 times brighter (near enough).
4 times
4 times as bright.
A magnitude 2 star is 2.5 times brighter than a magnitude 4 star because each difference in magnitude corresponds to a difference in brightness of approximately 2.5 times.
A star that is brighter than another.