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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.
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.
