Black in sentence

5065 examples of Black in a sentence

And they were threatened by those black ships there, that had been in Tokyo harbor over the last year.

And he said, "Doesn't matter if a cat is white or black, as long as it catches mice."

When I try to explain why I'm back, after telling the press Apple's future is black.

This is the basic question of somebody who's interested in finding and studying black holes.

Because black holes are objects whose pull of gravity is so intense that nothing can escape it, not even light, so you can't see it directly.

So, my story today about black holes is about one particular black hole.

I'm interested in finding whether or not there is a really massive, what we like to call "supermassive" black hole at the center of our galaxy.

And second, it gives us the opportunity to understand how these supermassive black holes interact with their environment, and to understand how they affect the formation and evolution of the galaxies which they reside in.

So, to begin with, we need to understand what a black hole is so we can understand the proof of a black hole.

So, what is a black hole?

Well, in many ways a black hole is an incredibly simple object, because there are only three characteristics that you can describe: the mass, the spin, and the charge.

But today, the way I want you to understand a black hole, for the proof of a black hole, is to think of it as an object whose mass is confined to zero volume.

This is a virtual radius, not reality; the black hole has no size.

It's important because it tells us that any object can become a black hole.

That means you, your neighbor, your cellphone, the auditorium can become a black hole if you can figure out how to compress it down to the size of the Schwarzschild radius.

And then it's a black hole.

So, if I were to compress the Earth down to the size of a sugar cube, it would become a black hole, because the size of a sugar cube is its Schwarzschild radius.

So, if I were to take the sun and compress it down to the scale of the University of Oxford, it would become a black hole.

And it's actually quite a useful concept, because it tells us not only when a black hole will form, but it also gives us the key elements for the proof of a black hole.

I need to understand the mass of the object I'm claiming is a black hole, and what its Schwarzschild radius is.

So, my job in convincing you that there is a black hole is to show that there is some object that's confined to within its Schwarzschild radius.

Okay, so, I'm going to talk about no ordinary black hole; I'm going to talk about supermassive black holes.

So, I wanted to say a few words about what an ordinary black hole is, as if there could be such a thing as an ordinary black hole.

An ordinary black hole is thought to be the end state of a really massive star's life.

And inside that supernova remnant is going to be a little black hole that has a mass roughly three times the mass of the Sun.

On an astronomical scale that's a very small black hole.

Now, what I want to talk about are the supermassive black holes.

And the supermassive black holes are thought to reside at the center of galaxies.

So, what people have thought is that perhaps there are supermassive black holes which matter is falling on to.

So, you can't see the black hole itself, but you can convert the gravitational energy of the black hole into the light we see.

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