Just wanted to say I’ve been enjoying a lot of your videos lately. Big fan of this subject and this is great for people new to the material. Is somehow both more informative but very basic and easy to follow.
One thing that never fails to surprise me... was how negative the science media was surrounding LIGO prior to its first collision detection. I remember reading about it many years ago, how its frequency range was outside the range of what waves we expected to pass us with enough magnitude, that it needed to be upgraded just to have half a hope of detecting anything at all... And then it detected a BH-BH merger. I'm glad someone believed in it enough to fund it! Because we're learning so much more about our universe that otherwise would not have been possible!
Well in general dying low mass stars can’t make heavy elements. Unless of course they’re in a binary system and they collide in a supernova. By the way I do have a video of that soon go hunt around
@@JasonKendallAstronomer Thank you for your reply. I really enjoy your videos, and learn a lot from them. My question was in reference to the chart you presented at 29:44 in the video. It showed the largest proportion of the heaviest elements being produced in 'Merging Neutron Stars' (coded in yellow), but also a generally smaller proportion of those same atoms created in 'Dying Low Mass Stars' (coded in orange). I was surprised to see that information, as it contradicted what I had been led to believe. Could you comment on the accuracy of that information please. Thanks again.
yes, it is accurate. Here, we mean stars that are not dying in a supernova, but by puffing off their atmospheres that have been enriched by dredging up elements from deep within the contact zones between their upper convective regions and the lower radiative regions. During later stages of a star's life (i.e. more than a solar mass, but not enough to make a supernova), stars are pulsationally unstable. This happens because of the luminosity generations rates for stars that are depleted of hydrogen on their cores. This causes the convective regions to sink deeply into the star's core, and pull up hevier elements which are then scattered in the subsequent planetary nebula.
@@JasonKendallAstronomer So Sirius B could have produced a limited quantity of gold and other heavy elements on it's way to becoming a white dwarf 120 million years ago. That is so fascinating. Thanks again.
32:20 when you're talking about two black holes colliding --- what about all the material and activity going on around the event horizon? Wouldn't that generate signals and activity besides gravitational waves that we can detect?
Ah that won't do much, as it's not coherent enough to make such waves. Now, they WOULD, but the problem is detectability and signal patterns. GW's for mergers have distinct patterns to search for. But the chaff around them would be noise, and a much smaller signal.
1:22 medium size. My shoes. While my gloves are small. And the ears XL. but the shoes M. Like a few dozen solar masses combining. Trivial. What else in CNN? LOL 4:14, A FEWWW SECONDS EARLIERRR! That's what I call serendipity!!!
This channel is criminally undersubscribed. Proper science explained clearly and without undue embellishment.
al McDonald
Indeed
Just wanted to say I’ve been enjoying a lot of your videos lately. Big fan of this subject and this is great for people new to the material. Is somehow both more informative but very basic and easy to follow.
Awesome, thank you!
One thing that never fails to surprise me... was how negative the science media was surrounding LIGO prior to its first collision detection.
I remember reading about it many years ago, how its frequency range was outside the range of what waves we expected to pass us with enough magnitude, that it needed to be upgraded just to have half a hope of detecting anything at all...
And then it detected a BH-BH merger.
I'm glad someone believed in it enough to fund it! Because we're learning so much more about our universe that otherwise would not have been possible!
Neutron stars are tiny, but when you think of them as a single atomic nucleus 10 km across, that puts a different spin on things... beyond strange...
Many places I see on charts Time in minus sign (-) .. that made little disturbing for me !!! How that ??? Like chart in this video at minute 5
It would have been nice had you explained how dying low mass stars can also form heavy elements.
Well in general dying low mass stars can’t make heavy elements. Unless of course they’re in a binary system and they collide in a supernova. By the way I do have a video of that soon go hunt around
@@JasonKendallAstronomer Thank you for your reply. I really enjoy your videos, and learn a lot from them. My question was in reference to the chart you presented at 29:44 in the video. It showed the largest proportion of the heaviest elements being produced in 'Merging Neutron Stars' (coded in yellow), but also a generally smaller proportion of those same atoms created in 'Dying Low Mass Stars' (coded in orange). I was surprised to see that information, as it contradicted what I had been led to believe. Could you comment on the accuracy of that information please. Thanks again.
yes, it is accurate. Here, we mean stars that are not dying in a supernova, but by puffing off their atmospheres that have been enriched by dredging up elements from deep within the contact zones between their upper convective regions and the lower radiative regions. During later stages of a star's life (i.e. more than a solar mass, but not enough to make a supernova), stars are pulsationally unstable. This happens because of the luminosity generations rates for stars that are depleted of hydrogen on their cores. This causes the convective regions to sink deeply into the star's core, and pull up hevier elements which are then scattered in the subsequent planetary nebula.
@@JasonKendallAstronomer So Sirius B could have produced a limited quantity of gold and other heavy elements on it's way to becoming a white dwarf 120 million years ago. That is so fascinating. Thanks again.
so would that be another official picture of a black whole by vla
32:20 when you're talking about two black holes colliding --- what about all the material and activity going on around the event horizon? Wouldn't that generate signals and activity besides gravitational waves that we can detect?
Ah that won't do much, as it's not coherent enough to make such waves. Now, they WOULD, but the problem is detectability and signal patterns. GW's for mergers have distinct patterns to search for. But the chaff around them would be noise, and a much smaller signal.
@@JasonKendallAstronomer thanks Jason! It is very interesting stuff to think about and try to visualize
1:22 medium size. My shoes. While my gloves are small. And the ears XL. but the shoes M. Like a few dozen solar masses combining. Trivial. What else in CNN? LOL 4:14, A FEWWW SECONDS EARLIERRR! That's what I call serendipity!!!