Gravitational Waves' First Light

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Күн бұрын

Without exception, Gravitational Wave discoveries are one of the most important developments in all of science. Predicted by Einstein in 1911, they were finally observed in 2016. In August of 2017, their counterparts were seen with telescopes. This is part of my complete intro Astronomy class that I taught at Willam Paterson University and CUNY Hunter.
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Credit links for this video
www.ligo.caltech.edu/page/pre...
www.eurekalert.org/multimedia...
hubblesite.org/images/news/rel...
chandra.harvard.edu/photo/2017...
public.nrao.edu/news/radio-ey...
www.spitzer.caltech.edu/images...
www.ligo.caltech.edu/images
www.ligo.caltech.edu/video/li...
www.ligo.caltech.edu/video/li...
www.ligo.caltech.edu/video/li...
Supplement the videos with "OpenStax Astronomy"
openstax.org/books/astronomy/...
23: The Death of Stars
openstax.org/books/astronomy/...
24: Black Holes and Curved Spacetime
www.ligo.caltech.edu/page/about
The Laser Interferometer Gravitational-Wave Observatory (LIGO)
www.nobelprize.org/prizes/phy...
The Nobel Prize in Physics 2017
en.wikipedia.org/wiki/First_o...
First observation of gravitational waves GW150914
www.ligo.caltech.edu/gallery
LIGO Gallery
en.wikipedia.org/wiki/Hulse-T...
Hulse-Taylor binary
www.black-holes.org
Simulating eXtreme Spacetimes (SXS) project
• Most Precise Ruler Eve...
Most Precise Ruler Ever Constructed
sci.esa.int/lisa-pathfinder/56...
Gravitational Wave form
en.wikipedia.org/wiki/Gravita...
Too Much on Gravitational Waves
www.ligo.caltech.edu/image/76
Known black holes
en.wikipedia.org/wiki/Lovell_...
Lovell Telescope
www.jb.man.ac.uk/news/2004/dou...
First-Known Double Pulsar Opens up New Astrophysics
www.eurekalert.org/pub_releas...
Discovered! Neutron star collision seen for the first time
en.wikipedia.org/wiki/Kilonova
Kilonova
www.eso.org/public/videos/eso...
Neutron star merger animation ending with kilonova explosion
www.eurekalert.org/pub_releas...
First observations of merging neutron stars mark a new era in astronomy
svs.gsfc.nasa.gov/12740
Doomed Neutron Stars Create Blast of Light and Gravitational Waves
www.caltech.edu/news/caltech-...
Caltech-Led Teams Strike Cosmic Gold
theconversation.com/cosmic-al...
Cosmic alchemy: Colliding neutron stars show us how the universe creates gold
hubblesite.org/image/4077/news...
The First Light with Hubble
www.spitzer.caltech.edu/images...
The First Light with Spitzer
chandra.harvard.edu/photo/2017...
The First Light with Chandra
public.nrao.edu/news/radio-ey...
The First Light with the VLA
0:00 Introduction
0:01 The Gravitational Wave Spectrum
1:32 What if Two Neutron Stars Collided?
4:54 The Hulse-Taylor Pulsar Binary
9:00 Pulsar Workhorse!
10:24 Double Pulsars
11:38 Creation of a Double Pulsar and Kilonova
14:04 The First Light: August 17, 2017
16:13 The First GW from Merging Neutron Stars
19:05 Zooming in on GW170817
25:20 Binary Neutron Stars Mergring with Jets
26:03 Neutron Star Collisions make Gravitational Waves
29:45 KEY WEBSITES
31:54 Masses in the Stellar Graveyard

Пікірлер: 17

@almcdonald8676 5 жыл бұрын

This channel is criminally undersubscribed. Proper science explained clearly and without undue embellishment.

@keithbaker9160 4 жыл бұрын

al McDonald Indeed

@Choofalong 3 жыл бұрын

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.

@JasonKendallAstronomer 3 жыл бұрын

Awesome, thank you!

@LordPhobos6502 3 жыл бұрын

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!

@drwisammjacob2692 3 жыл бұрын

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

@penrythajanitor4644 Жыл бұрын

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...

@marcocambray7725 Жыл бұрын

so would that be another official picture of a black whole by vla

@charlesmartin1121 3 жыл бұрын

It would have been nice had you explained how dying low mass stars can also form heavy elements.

@JasonKendallAstronomer 3 жыл бұрын

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

@charlesmartin1121 3 жыл бұрын

@@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.

@JasonKendallAstronomer 3 жыл бұрын

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.

@charlesmartin1121 3 жыл бұрын

@@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.

@elijaguy 2 жыл бұрын

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!!!

@somnuswaltz5586 2 жыл бұрын

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?

@JasonKendallAstronomer 2 жыл бұрын

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.

@somnuswaltz5586 2 жыл бұрын

@@JasonKendallAstronomer thanks Jason! It is very interesting stuff to think about and try to visualize