Journey to a Black Hole: Sagittarius A-Star & Cosmic Monsters | SPACETIME Full Documentary

What happens beyond the point of no return—and could a black hole ever threaten Earth?
In this SPACETIME special, astronaut Prof. Ulrich Walter takes you from stellar collapse to the Milky Way’s core, explaining how black holes form, what Sagittarius A-Star is doing at our galaxy’s center, and how we study the unseeable with real data and physics.

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What You’ll See

Types of black holes: stellar-mass, intermediate, and supermassive

How stars collapse: supernovae, Schwarzschild radius, event horizons

Accretion disks, jets, and why black holes glow though no light escapes

The Milky Way’s center: Sagittarius A-Star and what we’ve measured

Spaghettification: tidal forces on matter (and astronauts!)

Event Horizon Telescope images & gravitational waves (LIGO/Virgo)

Are any near us—and are we in danger? (short answer: no)

Chapters
0:00 Why Black Holes Captivate Us
3:05 From Star to Singularity: Collapse & Horizons
7:30 Feeding the Beast: Disks, Jets & Magnetic Fields
12:10 Milky Way’s Monster: Sagittarius A-Star
16:40 Spaghettification: Tides, Time Dilation & Relativity
21:20 Seeing the Invisible: EHT, LIGO & Modern Evidence
26:10 Nearby Black Holes & Earth’s Safety
30:00 Open Questions & What’s Next

Details & Keywords
Black hole documentary, SPACETIME Science Show, Ulrich Walter, Sagittarius A-Star, event horizon, accretion disk, relativistic jets, Schwarzschild radius, spaghettification, supernova, gravitational waves, LIGO, Virgo, Event Horizon Telescope, Milky Way center, cosmology documentary, astronomy

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