Tav, using their Pet Owner Voice: What have you got in your mouth? What are you eating? Drop it! Drop it right now!
Scratch: [whines and drops Wyll's boot]
Owlbear Cub: [guiltily spits out Boo, alive and unharmed]
Halsin, currently a bear: [drops a half-eaten salmon and makes an indignant noise]
Astarion: [startles at the raised voice, lets go of Tav's wrist, reclaims it and goes back to his breakfast once he realises they're not talking to him]
Gale: [chewing faster]
Tav, sternly: Gale...
Gale: [reluctantly spits out a powerful magical artefact into Tav's outstretched hand]
Tav, muttering under their breath: Can't have shit in the Gate.
Gale, ruefully rubbing the back of his neck, also under his breath: Gods forbid a wizard do anything
There's nothing more iconic for Astronomy over the last few years than the images taken first of M87 black hole, then more recently the image of our very own Milky Way Sag A*.
But how exactly do you see something that by it's very nature has a gravitational pull so vast that even light cannot escape it ?
In truth, you're not looking at the black hole, you're looking at the debris that's swirling around it, otherwise known as the accretion disk.
The best way to describe this is to imagine a bath with bubbles, and a horizontal view across the bath at water level. You pull the plug, but as an observer looking along the water line, you won't see the whirlpool pulling all the water in, but you may notice a concentration of suds around the area where it's occurring.
This in effect is what we see with the black hole, the matter now caught in the gravity but not yet at the point of no return, the event horizon.
Some black holes have little or no matter whirling around them, particularly stellar black holes that no longer have any binary partners, orbiting the galaxy alone and in the dark, and we simply cannot see them until something interacts with them.
While others like our central black holes, massive objects accelerating matter caught in the spin to near the speed of light. In much the same way as your hands warm up when rubbed together, so does the matter hurling around the black hole, creating a ring debris, and closer in crushed, smashed and heated up to plasma.
It orbits the black hole, and in many cases will do so for billions of years before falling in, if at all.
Some Galaxies, like M87, have incredibly active black holes, consuming huge quantities of material, some of which is pushed to the poles and fired out at the speed of light, creating these monstrous jets of radiation. Thankfully Sag A* is fairly quiet in comparison, and that's a good thing for us, because we're right in the path of it, albeit 25,000 light years away.
So, just as you cannot see the wind, but you can see the tree's move, we cannot see black holes, but we very much can see when they interact with objects around them.
Source :
The massive object at the galaxy’s center is invisible. But this year’s picture of the swirling plasma around its edges will help to reveal
There's nothing more iconic for Astronomy over the last few years than the images taken first of M87 black hole, then more recently the image of our very own Milky Way Sag A*.
But how exactly do you see something that by it's very nature has a gravitational pull so vast that even light cannot escape it ?
In truth, you're not looking at the black hole, you're looking at the debris that's swirling around it, otherwise known as the accretion disk.
The best way to describe this is to imagine a bath with bubbles, and a horizontal view across the bath at water level. You pull the plug, but as an observer looking along the water line, you won't see the whirlpool pulling all the water in, but you may notice a concentration of suds around the area where it's occurring.
This in effect is what we see with the black hole, the matter now caught in the gravity but not yet at the point of no return, the event horizon.
Some black holes have little or no matter whirling around them, particularly stellar black holes that no longer have any binary partners, orbiting the galaxy alone and in the dark, and we simply cannot see them until something interacts with them.
While others like our central black holes, massive objects accelerating matter caught in the spin to near the speed of light. In much the same way as your hands warm up when rubbed together, so does the matter hurling around the black hole, creating a ring debris, and closer in crushed, smashed and heated up to plasma.
It orbits the black hole, and in many cases will do so for billions of years before falling in, if at all.
Some Galaxies, like M87, have incredibly active black holes, consuming huge quantities of material, some of which is pushed to the poles and fired out at the speed of light, creating these monstrous jets of radiation. Thankfully Sag A* is fairly quiet in comparison, and that's a good thing for us, because we're right in the path of it, albeit 25,000 light years away.
So, just as you cannot see the wind, but you can see the tree's move, we cannot see black holes, but we very much can see when they interact with objects around them.
Source :
The massive object at the galaxy’s center is invisible. But this year’s picture of the swirling plasma around its edges will help to reveal
This image shows a smoothed reconstruction of the total (mostly dark) matter distribution in the COSMOS field, created from data taken by the NASA/ESA Hubble Space Telescope and ground-based telescopes. It was inferred from the weak gravitational lensing distortions that are imprinted onto the shapes of background galaxies. The colour coding indicates the distance of the foreground mass concentrations as gathered from the weak lensing effect. Structures shown in white, cyan, and green are typically closer to us than those indicated in orange and red. To improve the resolution of the map, data from galaxies both with and without redshift information were used.
The new study presents the most comprehensive analysis of data from the COSMOS survey. The researchers have, for the first time ever, used Hubble and the natural "weak lenses" in space to characterise the accelerated expansion of the Universe.
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