|Danny M2Z||12/04/2019 11:06:14|
724 forum posts
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 Haine||12/04/2019 11:23:06|
|2448 forum posts|
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 1||12/04/2019 17:28:30|
|397 forum posts|
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 !
1561 forum posts
Every 10mm socket comes with its own free black hole.
|1043 forum posts|
Danny, you are not the only one with a workshop floor that acts like a black hole
|Neil Wyatt||12/04/2019 18:03:19|
15808 forum posts
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.
15156 forum posts
How do we know it's a black hole and not an orange ring?
|Boiler Bri||12/04/2019 18:32:09|
728 forum posts
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 Bri||12/04/2019 18:43:42|
728 forum posts
Sorry. Had a bad week. 😳. I know that space is a good subject for some people.
|Sam Longley 1||12/04/2019 20:51:18|
|702 forum posts|
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 really
|409 forum posts|
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...
1152 forum posts
This was the best explanation I saw.
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.