This week we continue our month-long journey through the world of galaxies, but this time, we venture into one of astronomy’s darkest frontiers. Beyond the glowing spirals and brilliant star clouds lies a universe filled with hidden structures, invisible matter, and mysteries that continue to challenge modern science.

We venture into the Zone of Avoidance, a cosmic blind spot created by the dust and stars of our own Milky Way, and ask whether entire galaxies may still be hiding just beyond our view. From ghostly ultra-diffuse galaxies like Dragonfly 44, to the invisible gravitational scaffolding of dark matter, we’ll follow the clues that reveal a universe far stranger than it first appears.

Along the way, we’ll look at the mind-bending beauty of gravitational lensing, the mysterious pull of the Great Attractor, and the breathtaking s ...