Einstein's Thought Experiment That Transformed Physics

By imagining how light travels to two people moving at different speeds, Einstein showed that time isn’t absolute. His thought experiment revealed that what seems like “now” depends on where you are and how fast you’re moving.

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Clip Season 42 Episode 23 Length 02:10 Premiere: 11/25/15

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Clip Length 02:10 Premiere Date 11/25/15

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Top

Einstein's Thought Experiment That Transformed Physics

Recent Episodes

Return to the Moon

Rain Bombs

Athens: Birth of Democracy

Stone Age Temple Mystery

Mammal Origins

Can Dogs Talk?

Sponsored by:

Clips & Previews

Einstein’s Thought Experiment

Gravity's Effect on Spacetime

What is Spacetime?

How Einstein Changed the Way We Understand Gravity

Einstein's Thought Experiment That Transformed Physics

Inside Einstein's Mind Preview

Sea Level Rise: When 1 in = 2 ft

Digital Domain of Warfare

CyberWar Threat Preview

The Power of the Flood Myth

Space Pics That Amaze Scientists

Ghosts of Subatomic Particles

Invisible Universe Revealed Preview

Specials

Interview: Discovering Dark Energy and the Hubble Tension with Nobel Prize Winner Adam Riess

Interview: Evolution of New Species, Venom, Wings, and More with Sean B. Carroll

Interview: De-Extinction, Dire Wolves, and Jurassic Park with Beth Shapiro

Particles of Thought: The Extremophile’s Guide to Life

Interview: The Animal Translator with Erich Jarvis

Interview: Brain Guru with Heather Berlin

Interview: Bob and Mike’s Big Idea with Bob Hazen and Mike Wong

Interview: Black Hole Badass with Janna Levin

Interview: The Deepfake Detective with Hany Farid

Interview: Mind of a Fossil Hunter with Kirk Johnson

When Machines Prescribe

Sands of Time

Keepers of the Coastline

Tides of Tradition

Standing the Heat

Megadroughts and Indigenous Voices

Harvesting the Future

Sea Change: Survival in the Gulf of Maine

Sea Change: Peril in the Gulf of Maine

Sea Change: Bounty in the Gulf of Maine

When Whales Could Walk (Español)

Ancient Builders of the Amazon (Español)

Ancient Maya Metropolis (Español)

Picture a Scientist (with Audio Description)

Treasures Metals Eiffel Tower

A Labyrinth of Lava

From Mud to Rock

Finding Stromatolites

Stromatolites Were Kings

Ancient Life

Millions of Years Captured in Chalk

A Fourteen-Foot Fish From Kansas

Hell Creek Formation

No Dinosaurs Above the Line

Mammal Survivors

Dinosaur Fossils

King of Gore

Driving Dinosaur Diversity

Pangea

Making Granite From Volcanic Rock

A Massive Volcanic Eruption

Rock Time Capsules

The Sandstone Top of the Canyon

Fossil-Filled Limestone

The Grand Canyon's Oldest Rocks

From Lava to Land

Semi-Precious Pebbles

Five Steps of Volcanic Rock

Tearing North America Apart

Fossilized Sand Dunes

Volcanoes of Sand

Rockies 2.0

Manhattan Schist

Manhattan Skyline

New York's Mountains

Mendenhall Glacier