The Hidden Universe: Cosmic Structures in the Dark

About this episode

This episode explores the hidden structures of the universe, including dark matter and ultra-diffuse galaxies, while providing a night sky report.

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 scale of the cosmic web, an immense network of filaments, nodes, and voids that connects galaxies across billions of light-years. Later in the show, we step back outside for your weekly night sky report, featuring dark skies after the new moon, evening views of Venus and Jupiter, pre-dawn glimpses of Saturn and Mars, early Milky Way core season, and a…

People in this episode

Host: Single Malt Sky

Topics covered

• galaxies
• dark matter
• cosmic structures
• gravitational lensing
• night sky report

Keywords

• dark universe
• galaxies
• dark matter
• gravitational lensing
• night sky

Mentioned in this episode

Books & works: The Hidden Universe: Cosmic Structures in the Dark

Places: Milky Way, Canes Venatici

More episodes of Star Trails: A Weekly Astronomy Podcast

• A Summer Sky Road Trip · June 7, 2026 · 31 min
• From the Archive: Star Party Stories · May 31, 2026 · 18 min
• The Birth and Death of Galaxies · May 24, 2026 · 29 min
• When Galaxies Collide · May 10, 2026 · 29 min
• Where the Milky Way Begins… and Ends · May 3, 2026 · 23 min
• The Invisible Architecture of the Universe, with Dr. Enrique Lopez Rodriguez · April 26, 2026 · 38 min