Looking at faraway stuff - The Bear and Badger

SpaceGazelle

Mmmm. It's certainly what enables you to have a finite universe without an edge. But an infinite universe? Why does it need to be bounded?

SpaceGazelle

I suppose an infinite amount of energy might fuck things up.

Vela

I might have my terminology or concepts (or both) confused. I checked the book that I was thinking of and what I should have been mentioning is a shape (universe) that is both finite but with no boundary.

(The book is about the Poincare conjecture, FWIW). Donal O'Shea's account of the solution and context behind it.)

SpaceGazelle

Speed of light in real-time.

https://youtu.be/_61SxDrdyhI

Vela

Nice. Now where's one from the perspective of the photon!

SpaceGazelle

Thought this might be more suitable in here.

Roger Boisjoly died. Top man.

SpaceGazelle

Jesus, that was ages ago and I've just found out now.

Dinostar77

Well who'd have thought it? The milky way isn't a flat-ish disc but warped and twisted.

https://www.theguardian.com/science/2019/feb/04/milky-way-is-warped-and-twisted-not-flat

cockbeard

Image looks like someone let Dali near a telescope

superflyninja

SpaceGazelle wrote:

I like this pic, which shows the relative size of Andromeda in our night sky. We don't see it because the light from the stars in another galaxy are too weak for us to see but it's there, and you can see it in infrared with the right equipment.

Fuck thats amazing. Like the others I thought the little fuzzy bit you can see was the majority of the galaxy. Wowza.

SpaceGazelle

This should please davy. Astroids irl.

https://www.thrillist.com/news/nation/nasa-attempt-to-knock-asteroid-out-of-orbit-2022

Dinostar77

https://www.independent.co.uk/life-style/gadgets-and-tech/news/earth-atmosphere-moon-size-distance-gas-layer-space-a8792746.html

This is a suprise, outmost part of the earths atmosphere reachs past the moon.

superflyninja

So then. A photo of a black hole. And it appears to be as predicted. Cor blimey......

Eric

Mental stuff. If I looked into it apparently I'd see the back of my head

Blocks100

It looks like a nice shiny ringed doughnut. Mind you, if I eat any more if those, I'll develop my own personal gravity well. Light can't escape from a black hole and doughnuts can't escape from me. Them be the laws of physics.

Dinostar77

Such an utterly pointless event. Wow a picture of material being sucked into a black hole.

GooberTheHat

Surely all space exploration is pointless then if thats your attitude?

Unlikely

Dinostar77 wrote:

Such an utterly pointless event. Wow a picture of material being sucked into a black hole.

You belong in a black hole.

acemuzzy

There was quite a lot of "people used to think you couldn't take a picture of a black hole cos it doesn't emit light - but we've got lots of countries together and been cleverer than that"

And then it wasn't really a picture of the black hole (because it doesn't emit light), but just stars round the outside.

So I was also a bit underwhelmed.

Dinostar77

Unlikely wrote:

Dinostar77 wrote:

Such an utterly pointless event. Wow a picture of material being sucked into a black hole.

You belong in a black hole.

Hahahahaha. love it

Dinostar77

acemuzzy wrote:

There was quite a lot of "people used to think you couldn't take a picture of a black hole cos it doesn't emit light - but we've got lots of countries together and been cleverer than that" And then it wasn't really a picture of the black hole (because it doesn't emit light), but just stars round the outside. So I was also a bit underwhelmed.

The detection of gravatational waves by LIGO was amazing, but yesterday was underwhelming.

Blocks100

Yeah, I was like, "Where's my front row ticket to the Event Horizon and why haven't I been turned into spaghetti yet?!"

superflyninja

That explains nicely what was expected to be seen in the image.
I think its a pretty major thing. It confirms that Einstein was right again and that black holes actually exist( it was highly suspected but not confirmed I think?).
And a lot of the light surrounding the black hole is matter orbiting at a high speed methinks.

Roujin

You man are maddddd. That picture is insane!

They had to synchronise 8 different telescopes using atomic clocks to get that photo! The effect of which was to create a telescope that is effectively the size of the planet!! And they had to be on standby for when the weather was perfect, they needed clear skies in all locations across those continents to do it!

In one evening's measurements, the team produced more data than the LARGE HADRON COLLIDER PRODUCES IN A YEAR.

You can also see the black hole in that image, I don't get what people don't understand about it. That black bit isn't "nothing". That black ring is not nothing, that black ring is the extent of the event horizon around whatever is at the centre of a black hole, and in this instance whatever is at the heart if this black hole is of sufficient mass to create a zone of diameter 7x the distance from the sun to Pluto that nothing is able to escape from.

For bonus marks this photo is of an object 10 million times further away from us than the closest star.

The amount of mind hurting extremes that that photo represents is crazy, and its wasted on people crying because they want a 1080p photo or something.

It's also super cool that when they talk about this black hole they have to use language like "this is the best evidence we have for the existence of black holes." Imagine being able to see something that takes everything we know about the universe and gets so weird with it that we don't actually know if these things are even what we think they are because they seem to break rules of the universe as we understand them.

ITS ONE OF THE LAST GREAT UNIVERSAL PHENOMENON THAT MANKIND DOES NOT UNDERSTAND BEYOND THE VERY BASICS OF WHAT WE SEE IT DOING TO THE OBJECTS AROUND IT AND THIS IS THE FIRST ACTUAL IMAGE OF ONE YOU PHILISTINES MAKE ME SICK, ETC.

g.man

Meh. It looks like a donut.

superflyninja

Or a well travelled Uranus.

Sorry. Someone had to.

Armitage_Shankburn

Roujin wrote:

You man are maddddd. That picture is insane!

They had to synchronise 8 different telescopes using atomic clocks to get that photo! The effect of which was to create a telescope that is effectively the size of the planet!! And they had to be on standby for when the weather was perfect, they needed clear skies in all locations across those continents to do it!

In one evening's measurements, the team produced more data than the LARGE HADRON COLLIDER PRODUCES IN A YEAR.

You can also see the black hole in that image, I don't get what people don't understand about it. That black bit isn't "nothing". That black ring is not nothing, that black ring is the extent of the event horizon around whatever is at the centre of a black hole, and in this instance whatever is at the heart if this black hole is of sufficient mass to create a zone of diameter 7x the distance from the sun to Pluto that nothing is able to escape from.

For bonus marks this photo is of an object 10 million times further away from us than the closest star.

The amount of mind hurting extremes that that photo represents is crazy, and its wasted on people crying because they want a 1080p photo or something.

It's also super cool that when they talk about this black hole they have to use language like "this is the best evidence we have for the existence of black holes." Imagine being able to see something that takes everything we know about the universe and gets so weird with it that we don't actually know if these things are even what we think they are because they seem to break rules of the universe as we understand them.

ITS ONE OF THE LAST GREAT UNIVERSAL PHENOMENON THAT MANKIND DOES NOT UNDERSTAND BEYOND THE VERY BASICS OF WHAT WE SEE IT DOING TO THE OBJECTS AROUND IT AND THIS IS THE FIRST ACTUAL IMAGE OF ONE YOU PHILISTINES MAKE ME SICK, ETC.

I still don't understand th picture.

1. I think it is a constructed picture. It's what you would see if it was possible to see the black hole

2. I don't know if the halo is the accretiondisk. It only looks like a disk because the light is bent by the strength of the gravity apparently.

3. A heavy object should bend light in towards the gravity, in my book (at least when I imagine a heavy ball on a tarpaulin, I see stuff bending towards the ball, not away)

4. So is the dark area bigger than it appears in the pic or what?

5. Is the accretion disk on a plane? All the artists impression show a plane, then they show the hawking radiation going "up'" and "down". If black holes are in fact a bit "flat" as a phenomenon (like a solar system) are we seeing the black hole "from the top"? Or is the artist impression merely illustrating a concept that is going on all over the place (ie in every direction),

6 in which case, the accretion disk is more like a sphere. So how can we see the event horizon at all?

Welcome to ozno ecience

acemuzzy

Roujin wrote:

You man are maddddd. That picture is insane! They had to synchronise 8 different telescopes using atomic clocks to get that photo! The effect of which was to create a telescope that is effectively the size of the planet!! And they had to be on standby for when the weather was perfect, they needed clear skies in all locations across those continents to do it! In one evening's measurements, the team produced more data than the LARGE HADRON COLLIDER PRODUCES IN A YEAR. You can also see the black hole in that image, I don't get what people don't understand about it. That black bit isn't "nothing". That black ring is not nothing, that black ring is the extent of the event horizon around whatever is at the centre of a black hole, and in this instance whatever is at the heart if this black hole is of sufficient mass to create a zone of diameter 7x the distance from the sun to Pluto that nothing is able to escape from. For bonus marks this photo is of an object 10 million times further away from us than the closest star. The amount of mind hurting extremes that that photo represents is crazy, and its wasted on people crying because they want a 1080p photo or something. It's also super cool that when they talk about this black hole they have to use language like "this is the best evidence we have for the existence of black holes." Imagine being able to see something that takes everything we know about the universe and gets so weird with it that we don't actually know if these things are even what we think they are because they seem to break rules of the universe as we understand them. ITS ONE OF THE LAST GREAT UNIVERSAL PHENOMENON THAT MANKIND DOES NOT UNDERSTAND BEYOND THE VERY BASICS OF WHAT WE SEE IT DOING TO THE OBJECTS AROUND IT AND THIS IS THE FIRST ACTUAL IMAGE OF ONE YOU PHILISTINES MAKE ME SICK, ETC.

Meh

cockbeard

Dinostar77 wrote:

acemuzzy wrote:

There was quite a lot of "people used to think you couldn't take a picture of a black hole cos it doesn't emit light - but we've got lots of countries together and been cleverer than that" And then it wasn't really a picture of the black hole (because it doesn't emit light), but just stars round the outside. So I was also a bit underwhelmed.

The detection of gravatational waves by LIGO was amazing, but yesterday was underwhelming.

I can only think that you don't actually understand what happened. Until yesterday black holes were theoretical

Yes everybody took them for granted, and assumed they existed, but not until now has it been shown. So it really is pretty momentous, unfortunately we've become desensitised because they were sexy and so Hollywood

cockbeard

Rouj and ninja have this

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