Stephen Hawking's Universe - EP3: Cosmic Alchemy (5/ 5)

What is the universe and everything in it made of? The creation of matter, the building up of elements in stars.

http://en.wikipedia.org/wiki/Nucleosynthesis

Category:

Howto & Style

Tags:

• Stephen
• Hawking
• Universe
• Nucleosynthesis

[tonyzmglm]

now imagine if heating the vapour even more, 10E6s of times more than you did at the begining, until the energy in each proton and neutron is enough for them to escape the forces binding them toguether in a similar way as water did. now imagine the oposite as the loose water molecules they will bind toguether into water droplets, similar to as when the universe cooled, the protons and neutrons bind toguether forming nuclei.

[tonyzmglm]

because after the universe cooled the collisions between them lacked energy for the protons and neutrons to scape from the hold of intramolecular forces, so they bind toguether. picture water, as its heated it gains energy, moving faster and faster, then each water molecule gain enough energy for them to escape from its liquid state, forming vapour,

[zacktillery]

Absolutely beautiful.

[sbergman27]

@tbillinger : Well... it looks like I managed to misspell "Coulomb" in my post. ;-)

[tbillinger]

@sbergman27 I stand corrected.  Learn something new every day.

[sbergman27]

@tbillinger : No. A particle with neutral charge neither attracts nor repels charged particles. That's basic "Coulob's Law". F=k(q1*q2)/r^2. If either q is 0, then the force between them is 0. The reason iron is attracted to both poles of a magnet is that the electrons in it are free to move around. A chunk of iron becomes polar in the presence of an electromagnetic field, The polarization direction depends on whether it is near the north or south pole of the magnet.

[mikeborja1]

this is a miracle universe

[wildsabes]

@farticlephysicist thx for the explanation, it is very much appreciated

[farticlephysicist]

@wildsabes

The antiparticle to the neutron is the antineutron which is composed of antiquarks. Neither the antineutron nor the neutron have a net electrical charge; however, they do differ in their bayron number and their magnetic moments are opposite to one another

[wildsabes]

@loselbuliros

It is close to the chicken-egg problem, though we can make the first thing, as far as we know, smaller and smaller.

There is a temperature 10^10 K at which electrons spontaniously 'come into existance'

at 10^13 K protons and neutrons appear.

Temperature is movement, so there would have to be only a few particles, that by colliding would make each other move faster, untill the effect would be a temperature where more particles started to 'pop up'

[wildsabes]

what is the anti-particle of a neutron?

For neutrons to have come into existance they must have anti-paticle, as I understand.

And a particle's anti-paticle is defined by having the same mass but the opposite electrical charge...

or is it, in the case of the neutron, a variation in nuclear force?

I'm a 15 year old boy trying to make sense of reality, please help :P

[loselbuliros]

Hi tonnyzmglm, sorry for my naive question, if in the beginning of the universe, matter and anti-matter were formed by pure energy, where did the energy itself come from? or this is like the egg-chicken problem? :)