Gravity as the curvature of space.

This is so good.

If the photon follows the curvature of space,

amazing.

It knows no other job in this world but to do that.

It's awesome.

But in addition, the original 1919 eclipse expedition

by Sir Arthur Eddington to test Einstein's general relativity

that light would bend near a gravity source.

So you wait for a total solar eclipse

because now you can see stars right up to the edge of the sun.

And you can see is their position the same

as when the sun isn't there.

And then you can see that the light bent.

Here's something nobody talks about.

The light would have bent even without Einstein's theories,

but it would only bend half as much.

Welcome to Star Talk, your place in the universe

where science and pop culture collide.

Star Talk begins right now.

This is Star Talk, Cosmic Query's edition.

And this one is Grab Bag.

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