Other > Off-topic discussions
What is light
Michaelh139:
--- Quote from: LagMaster on May 23, 2011, 06:12:41 pm ---other example: don't you feel more energyzied when the sun hits you wenn exiting a cold building?
--- End quote ---
No, I do not. I just feel hot and want to get out of it...
Ganado:
--- Quote from: pistacja on May 23, 2011, 02:09:11 pm ---Light is this stuff made out of photons and that makes it a really funny thing.
Why is it funny? Well for one we don't know if photons don't have a tiny bit of mass after all...if they do then light can't move with the speed of light.
Everyone knows there's antimater, so protons have anti-protons, electrons have anti-electrons and so on. But photons have photons, they are their own antiparticles.
It takes any photon 100 mln years to get from the core of the sun to its surface, and only 5 minutes to get from there to Earth.
The Univers started 13.5 mld years ago, so if nothing moves faster then light then the cosmos should be 13.5 mld lightyears across? Right?
Wrong! In fact it is way larger.
Funny.
--- End quote ---
About 13.7 is closer than 13.5. Also, it takes a little more than 8 minutes for light to get to Earth, not 5.
And that would be radius of the universe, not the full diameter. It would 13.7 * 2, or 27.4 billion light years. But really, those are all theoretical models - some scientists would say it is a perfect sphere, some would say it is relatively flat, some would say it is hyperbolic. Some would say the matter expanded in just 1 direction, not in every direction. You can't say that it is larger than the speed of light allows it to be, though.
Mayck:
--- Quote from: Dishonest Abe on May 23, 2011, 10:46:09 pm ---About 13.7 billion, not million.
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Actually the mld. stands for milliard not milion. And milliard is term used for 109 in large part of Europe (and billion stands for 1012)
U.S. billion = milliard
U.S. trilion = billion
Ganado:
Ugh, I hate those stupid differences. Why can't it just be the same for all countries, like basic numbers. Fixed my post.
Michaelh139:
--- Quote from: Dishonest Abe on May 23, 2011, 11:11:22 pm ---Ugh, I hate those stupid differences. Why can't it just be the same for all countries, like basic numbers. Fixed my post.
--- End quote ---
It's called Nationalism.
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