Black
in sentence
5065 examples of Black in a sentence
SD: So you may have heard of "spaghettification," where you fall into a
black
hole and the gravitational field on your feet is much stronger than on your head, so you're ripped apart.
This
black
hole is so big that you're not going to become a spaghetti noodle.
Where do you end up if you fall into a
black
hole?
So it turns out that the
black
hole in M87, that we saw before, is six and a half billion solar masses.
The
black
hole in the center of our galaxy is a thousand times less massive, but also a thousand times closer.
And suberin is really cool, because as you can see there, I hope, everywhere you see a
black
dot, that's a carbon.
Anything that gets too close to the central singularity of a
black
hole, be it an asteroid, planet, or star, risks being torn apart by its extreme gravitational field.
And if the approaching object happens to cross the
black
hole’s event horizon, it’ll disappear and never re-emerge, adding to the
black
hole’s mass and expanding its radius in the process.
There is nothing we could throw at a
black
hole that would do the least bit of damage to it.
Even another
black
hole won’t destroy it– the two will simply merge into a larger
black
hole, releasing a bit of energy as gravitational waves in the process.
By some accounts, it’s possible that the universe may eventually consist entirely of
black
holes in a very distant future.
In 1974, Stephen Hawking theorized a process that could lead a
black
hole to gradually lose mass.
But what happens when they appear just at the edge of a
black
hole’s event horizon?
If they’re positioned just right, one of the particles could escape the
black
hole’s pull while its counterpart falls in.
It would then annihilate another oppositely charged particle within the event horizon of the
black
hole, reducing the
black
hole’s mass.
Meanwhile, to an outside observer, it would look like the
black
hole had emitted the escaped particle.
Thus, unless a
black
hole continues to absorb additional matter and energy, it’ll evaporate particle by particle, at an excruciatingly slow rate.
A branch of physics, called
black
hole thermodynamics, gives us an answer.
Black
hole thermodynamics suggests that we can similarly define the “temperature” of a
black
hole.
It theorizes that the more massive the
black
hole, the lower its temperature.
The universe’s largest
black
holes would give off temperatures of the order of 10 to the -17th power Kelvin, very close to absolute zero.
The smaller the
black
hole, the hotter it seems to be burning– and the sooner it’ll burn out completely.
First of all, most
black
holes accrete, or absorb matter and energy, more quickly than they emit Hawking radiation.
But even if a
black
hole with the mass of our Sun stopped accreting, it would take 10 to the 67th power years– many many magnitudes longer than the current age of the Universe— to fully evaporate.
When a
black
hole reaches about 230 metric tons, it’ll have only one more second to live.
And while Hawking radiation has never been directly observed, some scientists believe that certain gamma ray flashes detected in the sky are actually traces of the last moments of small, primordial
black
holes formed at the dawn of time.
But if Stephen Hawking was right, before that happens, the normally terrifying and otherwise impervious
black
holes will end their existence in a final blaze of glory.
I flew home, I'm on the flight with my little
black
book and I took, you know, pages and pages of notes about it.
And when it's frontlit, it's
black
and white at three times the resolution.
This is where when you go outside, it's in
black
and white.
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