The brilliant stars Alnitak, Alnilam, and Mintaka (lower left to upper right) form Orion's Belt, one of the most prominent features in the night sky. All of the members of the belt are either current or future supergiants, which makes them among the biggest, brightest, and most massive stars in the galaxy. All are destined to end their lives with the titanic explosions known as supernovae. [Rogelio Bernal Andreo/Wikipedia]