In what year did Albert Einstein first propose his theory of general relativity?
Chapter 1

Einstein's wild prediction

Chapter 2

The ultimate measuring sticks

Chapter 3

The day the universe trembled

Chapter 4

The future of wave hunting

YOUR GOAL

Master of Ripples in spacetime

Ch 1 · Einstein's wild prediction
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artiteacher The math behind the invisible ripples

Jul 12

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artiteacher Einstein's wild prediction

Spacetime is waving... (oh-oh, waving!) / We caught the ripple of a black hole shaking! (caught the wave!)

Jul 10

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artiteacher The long search for proof

Jul 12

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The long search for proof

artiteacher For decades, scientists debated whether gravitational waves were real physical phenomena or just mathematical quirks.

Jul 10

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The math behind the invisible ripples

artiteacher Einstein calculated that moving heavy objects must create waves that travel through spacetime at light speed.

Jul 10

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Einstein's Cosmic Ripple
BETA

artiteacher Time the collision of black holes to discover how gravitational waves ripple through spacetime.

Jul 7

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Fun Fact

Einstein's doubt: Albert Einstein actually tried to retract his paper on gravitational waves in 1936, mistakenly believing they were a mathematical illusion before another physicist corrected his math.

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Jul 10

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Glossary
gravitational wave (noun)
A fluctuation in the curvature of spacetime that propagates as a wave at the speed of light. Albert Einstein mathematically proposed this phenomenon in 1916 through his theory of general relativity.

Jul 10

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Gossip

If you met Einstein, what would you ask him first?

Jul 10

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Quiz

What physical effect does a passing gravitational wave have on an object?

Jul 10

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artiteacher How waves stretch and squeeze reality

Jul 12

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Gossip

Would you want to feel spacetime stretching you?

Jul 10

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Quiz

In what year did Albert Einstein first propose his theory of general relativity?

Jul 10

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artiteacher Spacetime is like a giant trampoline

Jul 12

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Quiz

What is the name of the four-dimensional fabric that combines space and time in Einstein's theory?

Jul 10

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Quiz

At what speed do gravitational waves travel through the vacuum of space?

Jul 10

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Quiz

How does the stiffness of spacetime affect the size of gravitational waves?

Jul 10

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Quiz

Which celestial objects did Hulse and Taylor observe in 1974 to indirectly prove gravitational waves exist?

Jul 10

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Quiz

What Nobel Prize-winning discovery in 1974 provided the first indirect evidence of gravitational waves?

Jul 10

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Quiz

What did Albert Einstein believe about our ability to detect gravitational waves?

Jul 10