Rizwan Virk

of that object.

And suppose that object is like a million light years away from us.

So it's a lot closer, but it's still a million light years away.

So the decision about when the light goes to the left or to the right would have to be made when.

It would have to be made in the past, about a million years ago, because it takes light from that, let's say it's a black hole.

It's a million light years away, so it takes a million years for the light to reach Earth.

And we can measure whether it went to the left or to the right.

Well, it turns out that decision is in the past as we think of it.

But what the delayed choice experiment tells us is that that decision is made now when we measure.

That light, when the little telescopes – suppose we have two telescopes.

One picks up on the left.

One picks up on the right.

And it's when we do the measurement and until we do that measurement, both of those possibilities still exist.

So we have these two possible pasts.

A million years ago, right, the light went to the left or to the right.

But which one happened isn't decided until the measurement is done today.

So this is like Schrodinger's cat on steroids, right?

Well, that's what the experiment kind of showed with quantum mechanics.

Just like, okay, let's start with Schrodinger's cat because it's a simpler experiment.

Simpler version.