How to pronounce “light year” in English

is like light year in the future.

What's a light year?

But one light year is equal to about six trillion miles.

essentially 200 light year radius where another civilization would know that we're doing industry.

We think that that extends maybe a light year out into the universe, the radius of the Sun's influence, if you like, a light year.

I would argue that one light year is inconceivable.

You need to find this dark object which is one light year away.

And the thing is about a quarter of a light year away anyway.

And then we have 365 times that a light year, which is to the frozen edge of the Sun's influence, the edge of the Oort cloud.

to about 200-year radius, essentially 200-light year radius where another civilization would know that we're doing industry.

And then we have 365 times that, a light year, which is to the frozen edge of the Sun's influence, the edge of the Oort Cloud.

And so this-- it's a very small frame of view, just a fraction of a light year across.

How fast we travel in space, we measure this by light year.

And that may extend, according to some people, up to a light year or more out.

So Perseus A is actually in a system of a few hundred to a few thousand other galaxies that are all sort of gathered together across a ten million light year region.

You're telling me there's entanglement between different particles, and Einstein says that means that if I measure a particle here that is entangled with a particle a light year away,