The Pleiades are among the most recognized sights in the winter sky, a tight cluster of stars known across cultures as the Seven Sisters. They appear as a permanent fixture above us, a celestial family that has guided sailors, farmers, and storytellers for millennia. But this familiar gathering is not eternal. The stars are moving together through the galaxy, yet they are also slowly, inevitably coming apart.

This episode explores the life cycle of the Pleiades, from their birth one hundred million years ago to their eventual dispersal across thousands of light-years. We look at why the brightest blue-white stars in the cluster burn through their fuel so rapidly, and how the quiet gravitational evaporation of smaller stars is steadily dismantling the group. We also examine the faint blue nebulosity that surrounds the cluster, revealing it n ...