And nowhere does that seem more apparent than in a crowded city like New York. In fact, space is so real it can bend; space can twist, and it can ripple; so real that empty space itself helps shape everything in the world around us and forms the very fabric of the cosmos.
All of these developments tapped into something that had captivated Einstein since he was a child: light.
Not light bulbs and street lamps, but the very nature of light, itself.
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If the skater still feels her arms pulled outward, she'll know she's spinning. It's just uniform, still blackness all around you, and yet, your arms are being pulled outwards.
But if empty space is nothing, what is she spinning in relation to? So you say to yourself, "What could I be spinning with respect to? " Trying to answer questions like these, scientists came up with a bold new picture of space. When you go to the theater, you watch the actors, the scenery, the story.
And it was his fascination with one particularly weird feature of light, its speed, that would lead Einstein to overturn Newton's picture of space. Right now, we're traveling at about 20 miles per hour.
To go faster, all the driver needs to do is step on the gas, and the cab's speed changes.
To get a feel for this, take a look at that skater.