Invisible Universe: Unsolved Mysteries – Dark Matter and Dark Energy

The Invisible Universe: Unsolved Mysteries – Dark Matter and Dark Energy | Spacetime S07E04 WELT HD Documentary

00:00 Intro
Only five percent of the cosmos consists of visible matter — stars, planets, gas, and dust. The rest remains hidden: dark matter and dark energy, the mysterious backbone of the universe.

01:31 Chapter 1 – Mysteries of the Universe
Dark matter: invisible, yet shaping the structure of galaxies and galaxy clusters. Without it, our universe as we know it could not exist. But what exactly is this unknown mass, and how do scientists try to detect it?

11:03 Chapter 2 – Black Holes
The most extreme objects in the cosmos. Black holes stretch the fabric of space and time to its limits, playing a key role in galaxy formation — and in our quest to understand gravity itself.

17:17 Chapter 3 – Dark Energy and the Geometry of the Universe
Dark energy, a force that drives the accelerated expansion of the universe, dominates cosmic evolution. The Euclid telescope, named after Euclid of Alexandria, is designed to map galaxies across billions of light-years and help answer a fundamental question: Why does the universe look the way it does today?

24:42 Chapter 4 – Gravitational Lensing and Hubble’s Law
Mass bends light — gravitational lensing reveals how galaxies are distributed within the cosmic web. Hubble’s Law shows that the farther a galaxy is, the faster it moves away. These observations provide clues to the hidden geometry of space, vacuum energy, and the expansion of the universe.

35:42 Chapter 5 – WIMPs and the Search for Dark Matter
Weakly Interacting Massive Particles (WIMPs) are among the leading candidates for dark matter. Particle physics experiments at CERN and around the globe probe the unknown, searching for the building blocks of this invisible matter that could reshape our understanding of reality.

Dark matter and dark energy together account for about 95 percent of the universe. Unseen, untouchable, but essential — they define the fate of the cosmos. Exploring them is not only a scientific challenge, but a philosophical one: What is our place in a universe we can barely perceive?
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