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What is the apparrent magnitude of the star Betelguese?
The apparent magnitude of Betegeuse is 0.5 and it has an M2 spectrum making it a red star. Its distance is 420 light years and its absolute magnitude is -4.5 so it is 9 magnitudes brighter than the Sun; that is 4000 times brighter, so it's a giant. It is slightly variable in its brightness. At the same distance the Sun would be a 9th magnitude star, invisible except in a telescope.
Why does Rigel shine as brightly as betegeuse?
Rigel and Betelgeuse are both prominent stars in the night sky, but they are different types of stars. Rigel, a blue supergiant, shines brightly due to its high temperature and massive size, emitting more light than Betelgeuse, which is a red supergiant with a cooler surface temperature. However, from our perspective on Earth, Betelgeuse can appear similarly bright because it is much closer to us, despite having a lower intrinsic brightness. Thus, their apparent brightness is influenced by both their intrinsic properties and their distances from Earth.
What is the apparrent magnitude of the star Betelguese?
The apparent magnitude of Betegeuse is 0.5 and it has an M2 spectrum making it a red star. Its distance is 420 light years and its absolute magnitude is -4.5 so it is 9 magnitudes brighter than the Sun; that is 4000 times brighter, so it's a giant. It is slightly variable in its brightness. At the same distance the Sun would be a 9th magnitude star, invisible except in a telescope.
Can your sun ever turn into a black hole?
Our Sun cannot, we believe, turn into a black hole. The Sun has too little mass to undergo the supernova explosion that would crush the core of the star into a black hole. However, sometime "soon" (and in astronomy, "soon" could be anywhere within the next ten thousand years) we expect the red giant star Betegeuse to die just that way; a supernova explosion that will light up our sky like a second full moon, that will crush the core of the star into a black hole.
