Recent content by antd

The Universe is not spherical. Nobody knows what shape the universe is. Maybe you are talking about the observable universe, and that's spherical only because we cannot 'see' further (speed of light).

But this 'infinite', it seems it cannot really exist... Are you saying it is infinite because the expansion is faster than the speed of light? (in the flat universe) Surely it's a flaw in the current physical model, which is leading to this infinite

Then it seems that we don't know much about the Universe :P I don't know why anyone would say the universe is infinite though. Since it seems infinite cannot exist in reality. Shouldn't all scientists say 'our current theories are not compatible' or something to that extent... And yes, I think...

Yes, but this is a kind of concept which exists in the mind. It doesn't describe something that exists in reality.

But how can it be infinitely big? If the universe is infinite how can it make sense to say the universe is expanding? If something is infinite surely it doesn't need to expand, since it cannot get any bigger? And if it is infinite, surely we cannot know if it is expanding?! I read from NASA...

I have read in many places that the universe was once smaller than an atom. However, many people here have said this is a 'cartoon' version of the big bang theory. And that the media have popularized this invalid notion... I now have some questions, can I have the 'true' answer (what we know...

Thanks. Slowly learning not to trust wikipedia ;-)

I'm beginning to have a better understanding now! Although, Wikipedia says 'the speed of electricity' is often confused with 'the propagation speed of an electromagnetic wave'. So in that sense 'the speed of electricity' is the speed of the electrons, and not of the EM wave...

But how can it be explained in terms of speed? If the speed of electricity is slow (millimeters per second) how can the bulb light up instantly? Doesn't the 'electricity' have to travel the whole length of the wire? Or is it something like the single electrons pass it on to a neighboring...

I've read the thread but I still do not understand. Can someone help explain how the propagation of an electromagnetic wave is near the speed of light, but the speed of electricity is slow? (the water/traffic light analogies don't make sense to me) Does 'speed of electricity' mean the speed...

For some reason you find it difficult to admit that the military have to kill people. I'm just saying I think both sides are equally as bad. I just wondered if anyone has the same views as myself :)

Oh come on... 'serve your country' means to kill the enemy. I mean people on the front line who are given weapons etc... I am amazed you can say "the evil is done by their bosses"! Don't join the army/navy etc if you don't want to kill, surely? Again, how about the people who flew into the...

I'm 22 and I've accepted death :) I accepted it from 15, as I realized I cannot stop myself from dying. Before 15 I didn't really think about it. My genes have done a good job in stopping me from committing suicide :D Otherwise I'd happily die tomorrow. Maybe it sounds pessimistic, but...

Yes, I can clarify, all human killing is bad. (I just meant I can -understand- killing in defense or other situations. I'm just pointing out there's a difference between accidentally killing someone, and going into a school and killing every child. I hope you can see this difference! :) ) But...

I don't understand why everyone is all about supporting the troops These people kill other people I believe killing is wrong, also war is wrong... Am I out of line when I say I hate the troops as much as any other murderer/life taker?! I understand using troops for defense... But...