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Black Holes

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Danny M2Z12/04/2019 11:06:14
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751 forum posts
280 photos

I was nicely surprised when the first pictures of a black hole were published **LINK**

I waited a day but no posting from our esteemed Neil, he's probably still getting over the excitement

How fascinating that Albert Einstein could have predicted such mysterious things so long ago. We still live in interesting times.

My current black hole is my workshop - Things randomly disappear if I drop them so my workshop floor is my own 'event horizon'.

30 years ago my first black hole was my desk, or rather the computers that came and went from it's surface although my first home built Z-80 PC still survives from 1983 in working condition (with it's green screen).

* Danny M *

John Haine12/04/2019 11:23:06
2693 forum posts
138 photos

Certainly an amazing discovery. Actually it was a clergyman called John Michell who first suggested them in 1784! He just observed that a massy enough star would have an escape velocity faster than light. And it seems that Einstein actually didn't predict black holes himself though other people did using his theory shortly after it was first published - details in that Wikipedia link.

The Event Horizon Telescope has a website which has a load of excellent information on the system and how it works, well worth browsing.

larry phelan 112/04/2019 17:28:30
527 forum posts
11 photos

I too have a black hole,into which everything I want to use seems to vanish,sometimes never to be seen again.

Ex A box full of 6mm nuts,never taken out of the workshop, where did they go ??? Where indeed,that was six months ago.. Spanners,magnetic pick-ups 6 " rule ----------ect,ect.

All ideas welcome !

fizzy12/04/2019 17:34:54
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1625 forum posts
111 photos

Every 10mm socket comes with its own free black hole.

Thor12/04/2019 17:38:07
1137 forum posts
32 photos

Danny, you are not the only one with a workshop floor that acts like a black holewink

Thor

Neil Wyatt12/04/2019 18:03:19
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16740 forum posts
689 photos
76 articles

I spent a lot of time trying to understand the image, which is not well explained by the media, especially as they think it is a light not radio image.

I finally saw an explanation. It's the light from the accretion disk BEHIND the black hole being bent around the event horizon at 2.6 times its diameter. The edges of the black circle in the middle are actually a circular image of the centre of the far side of the black hole... now that mangles your brain cells!

So Harry Potter's invisibility cloak is probably woven from black holes...

Purely by coincidence (it really didn't occur to me at the time) I photographed M87 on Wednesday night. It's the large blob at bottom left. The curved line of galaxies is known as Markarian's Chain. There are about five dozen glaxies visible in this image, all part of the Virgo Cluster, itself part of the Virgo Supercluster which also contains our 'local group' of galaxies.

Markarian's Chain and M87

JasonB12/04/2019 18:27:48
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Moderator
16530 forum posts
1759 photos
1 articles

How do we know it's a black hole and not an orange ring?

Boiler Bri12/04/2019 18:32:09
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810 forum posts
285 photos

I am with Jason on this. Its thats far away it could be anything. Thats if it still exists? Too many people are out to get into the history books these days and make a name for themselves.

Boiler Bri12/04/2019 18:43:42
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810 forum posts
285 photos

Sorry. Had a bad week. 😳. I know that space is a good subject for some people.

Bri

Sam Longley 112/04/2019 20:51:18
727 forum posts
26 photos
Posted by Boiler Bri on 12/04/2019 18:43:42:

Sorry. Had a bad week. 😳. I know that space is a good subject for some people.

Bri

Spot on. Space has been a big subject in our house for some time.

I have been trying to get my wife to let me build another 3 feet onto the end of my shed for ages

It is all relative reallywink

Versaboss12/04/2019 23:24:07
428 forum posts
51 photos
Posted by Neil Wyatt on 12/04/2019 18:03:19:

... It's the light from the accretion disk BEHIND the black hole being bent around the event horizon...

Hi Neil,

Isn't the word 'light' in the sentence above a bit misleading? Afaik a radio telescope doesn't see 'light' in the sense we usually use that word. I suppose the black hole picture is a computer generated picture from whatever electromagnetic waves they received.

If I'm wrong, I am eager to learn more...

Regards,
Hans

Bandersnatch13/04/2019 01:02:38
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1280 forum posts
40 photos

This was the best explanation I saw.

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