The Andromeda galaxy is a giant spiral cluster of stars whose mass is that of billion Suns. You can see it with the naked eye as a faint elongated cloud in the night sky. Inasmuch as it subtends an angle of and is known to be larger than our own galaxy [ light-years (units of ly) in diameter for Andromeda as compared to light-years for our galaxy], how far away is it in light-years?