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Why is the black hole image so blurry? It's too far away [Copy link] 中文

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Post time 2019-4-12 17:58:30 |Display all floors
This post was edited by CeciliaQ at 2019-4-12 17:58

Humanity's first image of a black hole, which offers a glimpse of one of the weirdest spectacles in the universe, thrilled the world on Wednesday.

However, as people were amazed by "seeing the unseeable", many are wondering why the glowing donut is so blurry.

As a matter of fact, the image isn't really a photograph.

When we take a selfie, the light from the sun shines upon our faces and reflects into the smartphone camera. But a black hole is so dense that it sucks light in, leaving nothing visible reflected.

With that said, there are still things we can capture -- namely the objects around the black holes. When they are being sucked in, they rub with each other, creating light, radio waves and other things.

So we used eight radio telescopes on Earth to capture the radio waves and get an understanding of the black hole's shape.

So why it's so blurry? Just like taking a photo, the distance matters.

Try taking a photo of a cat from 100 meters away. It will appear so small that you can't recognize it no matter how you zoom in.

Though the M87 black hole is gigantic with a radius of 60 light years, it's 55 million light years away from us. That means the "cat" is about 23 million meters away. Try picture that and zoom in. No wonder it's blurry.

The scientists working at those eight telescopes have tried hard to take the picture back in 2017. The telescopes were combined to form an Earth-sized "lens" to capture the radio waves emitted from the M87.

As you may have realized, that also means what we captured was an ancient moment of the M87, literally a moment that happened millions of years ago. And it took almost all the latest technology we have right now to get it.

So, does that mean the black holes in sci-fi movies are fake? Not 100 percent. Since the real picture serves as another proof of the relativity, our previous artistic guessings are still vaguely valid.

Don't call filmmakers liars. At least they made you interested in seeing the blurry reality in the first place.
(Source: CGTN, by Gong Zhe)

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Post time 2019-4-13 06:41:33 |Display all floors

How come they can take the even an blurry photo of black hole that is 55 million light years away??

Considering one light year is nearly six Trillion miles, or 5,878,625,373,183 miles to be exact.

One million light years is 5,878,625,373,183 X 1,000,000 miles.

55 million light years is 5,878,625,373,183 X 1,000,000 X 55 miles.


How could they possibly take that photo??      




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Post time 2019-4-13 07:14:38 |Display all floors
No. The reason it is blurry, is because it is a composite image made from sub-millimetre radio wavelengths. Radio waves do not focus like light waves. As well, the analogy of photographing a cat, which is a solid, three-dimensional object is not appropriate at all. The accretion disk (event horizon) around a black hole is made up of gas, dust, and plasma moving at speeds approaching that of light. Think of trying to photograph an irregular galaxy, made up of gas and dust. Basically just an amorphous blob in space, with no actual structure (ie. rings) to it. All you get is a cloudy blob. The same with photographing the accretion disk at radio wavelengths. It's just an amorphous blob in the shape of a ring. Another analogy would be trying to photograph fog ... when you're inside it.
Stupid people are like Glowsticks. You want to snap them in half and shake the crap out of them until they see the light.
I love sarcasm. It's like punching someone in the head ... only with words

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Post time 2019-4-13 21:55:43 |Display all floors
sobabe Post time: 2019-4-13 06:41
How come they can take the even an blurry photo of black hole that is 55 million light years away?? ...

The event horizon was photographed using radio waves. Astronomers have photographed objects a lot farther away than 55 million LY. The Hubble Space Telescope has taken images from as far away as 10 - 15 BILLION light years.

Hubble Deep Field
Stupid people are like Glowsticks. You want to snap them in half and shake the crap out of them until they see the light.
I love sarcasm. It's like punching someone in the head ... only with words

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Post time 2019-4-14 09:26:16 |Display all floors
First of all, it is necessary to define what an image or a photo is.


Since no light can be free from the gravity of the black hole, so it is impossible for us human on earth with naked eyes to see any image of it.


What is the point of showing the general public something that your own self cannot identify?


Can it be used at a law court as evidence with such a blurred and unclear image? The answer is NO. So the whole thing, in my opinion, is a fraud, that wastes a lot of public money. We may as well ask advice from a crystal ball.

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Post time 2019-4-18 07:35:35 |Display all floors
reformist Post time: 2019-4-14 09:26
First of all, it is necessary to define what an image or a photo is.

I would take the time to respond to your nonsense properly, but it will have to wait until I finish laughingout loud at your ridiculous comment.

Maybe later.
Stupid people are like Glowsticks. You want to snap them in half and shake the crap out of them until they see the light.
I love sarcasm. It's like punching someone in the head ... only with words

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Post time 2019-4-18 16:40:49 |Display all floors
This is the horrific truth unfortunately for corrupt countries with black budgets . People wont even know the difference anyway, people will believe anything and always prefer to look the other way.

I have seen very smart people be fooled by the simplest of tricks,  this is just on a big scale but no different.  

Oh dear,  they might of well put a blurry donut .


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