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Ask a Physicist 2. Black Holes

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Video explaining what Black Holes are, where they come from and how we detect them. Fore more information see: http://cosmology.berkeley.edu/... A very interesting and well written article by Tedd Bunn http://antwrp.gsfc.nasa.gov/ht... A more complex artticle, but with interesting videos http://uk.youtube.com/watch?v=... - A Documentary on Stephen Hawking and Black Holes http://uk.youtube.com/watch?v=... A Documentary on the discovery of Super Massive Black Holes http://www.liveleak.com/view?i... A Documentary about the life and death of starsSome cool videos: http://uk.youtube.com/watch?v=...

Channel: Science & Technology
Uploaded: November 30, 1999 at 12:00 am
Author: ASKaPHYSICIST

Length: 08:09
Rating: 4.95
Views: 831

Video Comments

theboywhoskates (November 30, 1999 at 12:00 am)

what do black holes orbit around or do things orbit aound it even though i doubt that things can orbit around a black hole

ASKaPHYSICIST (November 30, 1999 at 12:00 am)

I never heard of that theory, but if you can show me where you found it I wouldn't mind reading up on it.

ASKaPHYSICIST (November 30, 1999 at 12:00 am)

Now I can't explain everything about light I'm afraid because not everything is known yet. The whole light speed barrier thing is something we observed but haven't explained. As Einstein said, It's a postulate.At the moment we sometimes think of light as particles and sometimes as waves, which isn't really accurate, but it works. String theory might give an answer to that problem. btw your writing is fine. I hope the answer helped

ASKaPHYSICIST (November 30, 1999 at 12:00 am)

well, the word you should use is mass not weight, but just because we think light (photons) doesn't have any doesn't mean it can't exist. It's pure energy. And you are quite right, light can bee seen as an electromagnetic wave, so we call it electromagnetic radiation.

Naggash1 (November 30, 1999 at 12:00 am)

I also heard a theory about light containing protons and neutrons which are the basics of matter along with electons and when they strike each other they freeze and that's how matter comes to exist. So all matters are freezed light.

Naggash1 (November 30, 1999 at 12:00 am)

Oh it's the 2. video i mean:)

Naggash1 (November 30, 1999 at 12:00 am)

theese things cannot be all true. It would be a paradox. So which of them are true, and which are not. What light really is?Oh and by the way. How do we now that nothing can be faster than light. cause if something does how could we notice it. sorry if I speak a little confusing I'm Hungarian. Lokking forward for your answer. Keep up the good job.

Naggash1 (November 30, 1999 at 12:00 am)

althogh about time if the photons travel with maximum speed ,time does not affect it, so its eternal. if it does not have weight it doesn't contain anything.Which means it doesn't exist which is also impossible. about black holes I heard that light is pulsing between 2 states:Electric and magnetic. this pulse gives us the frequency of light like uv, infrared etc.and when its magnetic black holes can affect it.

Naggash1 (November 30, 1999 at 12:00 am)

hi!I have seen all your videos and I do appriciate your work. The reason I post a comment on the 4. video is because I have questions on this theme. I'm a bit confused about the nature of light. according to einstein the faster you travel the more your weight multiplies and the more time slows down to you. which means light can not have weight, because it would be so heavy that it would have own gravitation, and also it would crush human body.

ASKaPHYSICIST (November 30, 1999 at 12:00 am)

well, you are kinda assuming that the earth fromed from disorderliness, which is not the case. The Big bang would actually have to be considerd the most orderd state the universe has ever been in. All the enegy and mass of the universe was focussed at one point. Well, this really is quite a fundamental question. I'm not sure I'm explaining this adequately. I'll try to make an episode on this.

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