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Explosion in Ophiuchus galaxy cluster

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Robin Graham28/02/2020 01:15:23
755 forum posts
186 photos

I've just read an article by Hannah Devlin, Science Correspondent on The Guardian in which she reports that there's been a bit of a bang, originating from the black hole in Ophiuchus cluster, which has made a 'void' about 15 Milky Way's (the galaxy, not the confectionery bar) diameter in the gas cloud. An unimaginable amount of energy involved.

The cluster is about 390 million light years away so if my calculation is right the edge of the hole is (or was about 390 million years ago?) over 380 million light years away, so no need to head for the hills just yet.

As if all this wasn't all mind-boggling enough, Devlin ends her article with:

"The event is thought to have taken place several hundred million years ago, with the black hole showing no signs of dramatic activity at present."

Unless I have misunderstood things (it wouldn't be the first time!) this is nonsense. How would we know what's happening out there 'at present'?

Robin.

 

 

 

Edited By Robin Graham on 28/02/2020 01:17:28

Bandersnatch28/02/2020 01:33:43
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1716 forum posts
60 photos
Posted by Robin Graham on 28/02/2020 01:15:23:

"The event is thought to have taken place several hundred million years ago, with the black hole showing no signs of dramatic activity at present."

Unless I have misunderstood things (it wouldn't be the first time!) this is nonsense. How would we know what's happening out there 'at present'?

 

We wouldn't, but she didn't say "happening" at present. She said "showing no signs ...at present".

Something happens out there, then some millions of years later we see the signs (of whatever that is) here.

Edited By Bandersnatch on 28/02/2020 01:34:01

not done it yet28/02/2020 01:34:55
4900 forum posts
20 photos

Unless I have misunderstood things (it wouldn't be the first time!) this is nonsense. How would we know what's happening out there 'at present'?

Too true. This event took place long before the dinosaurs started to roam the planet - probably twice as long as that.

Some journalists just don’t have a clue!

Robin Graham28/02/2020 02:28:43
755 forum posts
186 photos
Posted by Bandersnatch on 28/02/2020 01:33:43:
Posted by Robin Graham on 28/02/2020 01:15:23:

"The event is thought to have taken place several hundred million years ago, with the black hole showing no signs of dramatic activity at present."

Unless I have misunderstood things (it wouldn't be the first time!) this is nonsense. How would we know what's happening out there 'at present'?

We wouldn't, but she didn't say "happening" at present. She said "showing no signs ...at present".

Something happens out there, then some millions of years later we see the signs (of whatever that is) here.

Edited By Bandersnatch on 28/02/2020 01:34:01

Your reading was more precise than mine Bandersnatch - I yield! Hannah is acquitted!

Robin.

Mick B128/02/2020 09:18:37
1666 forum posts
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Posted by not done it yet on 28/02/2020 01:34:55:

...

Too true. This event took place long before the dinosaurs started to roam the planet - probably twice as long as that.

...

Yep - early fish developing as the first vertebrates, and the Devonian red sandstone being laid down on earth.

Mike Poole28/02/2020 09:40:13
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2700 forum posts
64 photos

I thought I heard a bang.wink

Mike

Neil Wyatt28/02/2020 09:52:14
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18141 forum posts
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'At present' is utterly meaningless on that sort of scale, it only make sense in the context of what we can see here and now.

SillyOldDuffer28/02/2020 10:27:18
Moderator
6194 forum posts
1345 photos

What is time?

I submit there is no such thing as 'at present', because it's the boundary between us and the past, constantly in motion, not a detectable instant. We are propelled into the future like flotsam on the tide, aware of the movement without understanding it.

As human perception lags reality by about 0.5 seconds, everyone is always out-of-date. Getting a signal from Ophiuchus 700 million years after the event is just a measure of how distant from reality we are on a bad day...

Dave

PS What Astrology believes about Ophiuchus is completely trustworthy!

blowlamp28/02/2020 11:06:10
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1397 forum posts
85 photos

This is the answer.

Georgineer29/02/2020 01:06:24
389 forum posts
17 photos
Posted by SillyOldDuffer on 28/02/2020 10:27:18:

What is time?

...

It's the property of the universe that stops everyhing happening at once.

Lately it doesn't seem to be working too well.

George B.

Nicholas Farr29/02/2020 07:44:47
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2409 forum posts
1188 photos
Posted by SillyOldDuffer on 28/02/2020 10:27:18:

What is time?

I submit there is no such thing as 'at present', because it's the boundary between us and the past, constantly in motion, not a detectable instant. We are propelled into the future like flotsam on the tide, aware of the movement without understanding it.

As human perception lags reality by about 0.5 seconds, everyone is always out-of-date. Getting a signal from Ophiuchus 700 million years after the event is just a measure of how distant from reality we are on a bad day...

Dave

PS What Astrology believes about Ophiuchus is completely trustworthy!

Hi Dave, "at present" can mean a moment of time, or a period of time, depending upon its context, i.e. a period of time can be defined as being at present when it is in a status que. Many threads on here are "at present" in a status que and have been for quite a while, because no one has added a post, and so "at present" remain unchanged.

Regards Nick.

Pero29/02/2020 07:55:23
114 forum posts

Well. At least we now know the reason for climate change!

A little further confusion - I thought that once black holes went bang they stopped being black holes and just went back to being space. Very odd.

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