X-ray Astrophysics: The High Energy Cosmos - Professor Carolin Crawford

[@erichodge567]

These are among the best popular science lectures ever given.

[@biplobsarkar756]

She explains the concepts so beautifully !! Thoroughly enjoyed it.

[@EmergentUniverse]

Most excellent whirlwind of information. Nicely done Professor Crawford.

[@abcde_fz]

Hey! This is really cool because Dr. shows how X-ray telescopes work, with slides and a show-and-tell mirror. Definitely interesting, I had NO IDEA that X-rays must use a COMPLETELY different method to focus images, you have to 'skip' the photons off of the interior surfaces of multiple nested cylindrical mirror elements, at very shallow angles, multiple times, each time decreasing (or increasing), the angle of reflection, (I'm not sure which it is, I'm too jazzed from learning this to get my physics correct), to focus the photons onto the imaging sensor. F**king Fascinating!!!

[@WildBillCox13]

Starts with a great, easy to follow, primer on the electromagnetic spectrum and where her topic lies on its graph. Thanks for posting!

[@kennethflorek8532]

As usual, a tour de force by the professor, cramming as much information on a topic as possible in an hour, while keeping the expostion clear. If what you appreciate about science are the facts and the explanations, and the colorful figures of speech you hear about galactic phenomena are wearing a bit thin on you, you have found your guru.

[@robertmerkle6879]

Maybe PBS has something easier to chew on for you?

[@kennethflorek8532]

Alpha Tango I don't know why you are reading my comment the opposite way. I am exasperated with the ever lessening science content of PBS science programs. The professor is my guru.

[@naimulhaq9626]

+Kenneth Florek She speaks out of memory, no written speech, accurate and very informative. Beautiful.

[@ghostfacechilla1027]

+Kenneth Florek I hear you

[@Raydensheraj]

That's why Books and the original research papers are available. Also there are great Books about XRay Astronomy/Astrophysics.

[@GreshamCollege]

It is our pleasure (especially when the lectures are as worth spreading as this!) We hope that you will continue to enjoy the lectures!

[@josephkarpinski9586]

Excellent, excellent, excellent! They should really consider segmenting these videos into a course on Edx or Coursera.

[@arash4787]

Awesome!

[@WisemanTimes]

The Sun's stellar classification, based on spectral class, is a G-type main-sequence star (G2V) and is informally designated as a yellow dwarf because its visible radiation is most intense in the yellow-green portion of the spectrum, and although its color is white, from the surface of the Earth it may appear yellow because of atmospheric scattering of blue light.

[@yoshiakihiyama8486]

By refering to first theory of relativity--old school-- would you empasize what was the time factor the x-ray travelled light years away ?

[@TheManglerPolishDeathMetal]

shes amazing

[@sven6737]

I can only follow the other comments - really great! unfortunaly only about 700 clicks, that doesnt reflect the quality!

[@KyleStratacusDrewry]

IF YOU HAVE A STUPID HORRIBLE COUGH, LEAVE THE DAMN RECORDING AREA.

[@InfoCousins]

Looking at the topics discussed in the meeting, I think it is fair to say that presenter get stuck at too many points for no reason other than her "presentation lessons". Just explain the topic with the thrill that you have, if you don't have the thrill; let others present these topics.

[@muhammadalkhawarizmi3630]

42:14 Supernovae activity.

[@SideWalkAstronomyNetherlands]

to bad she doesn't speak Dutch or German...there is only so much one can express in English :(

[@FlockOfHawks]

Referring to the iron ion perhaps ? (~ 0:51) ( btw / vat ) : "Too bad ..."

[@paulwilkinson1539]

Prof. Carolin waves her arms round so much in these fantastic lectures that I can't work out if she wears a wedding ring on her left hand..... Oh well, back to her latest hairdo and not to mention the fantastic physics.

[@extrasolar213]

:D

[@EDDIXspider]

Boring ,worse lecture ever .

[@thecuriousowl6663]

Veder Georgiev maybe you don't understand a single thing

[@emmanichol3613]

She is a great speaker making things easy to understand for everyone

[@jasmineluxemburg6200]

Boring, worst comment ever

[@Olhar.Internacional]

cool, didn't expect that cold objects such as comets would emit detectable levels of X-ray!

[@perum3183]

wow! very much informative ....

[@ronspence7368]

peru M gg

[@Kimikoramirez]

Thank you for making this lecture available. I have always been fascinated with astrophysics and although late in life now as the mother of a teen, I plan on going back to school. Your lecture kept my complete attention and only helped to confirm that this is what I want to study. Thank you!

[@RonJohn63]

15:35 With that *huge* mass of X-ray emitting gas, are those hundreds of thousands of galaxies sterile (incapable of supporting life, even on planets with a magnetosphere)?

[@semicolonlkj]

RonJohn63 don’t forget that energy reduces with the square of the distance.

[@WisemanTimes]

i was referring to its colour not its exact definition

[@WisemanTimes]

our star is white not yellow... 6:30 or so

[@raistlin2k3]

no... in technical terms, our sun is a "yellow dwarf star"

[@DevAngelo]

Breaking that telescope would bring a lot of bad luck

[@hastinmy]

ok