Rank #1067 on ContentLevel 212 Comments: Comedic Genius
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latest user's comments
|#39 - I'd like to volunteer because I absolutely love this site and …||01/21/2015 on Looking for a new mod||0|
|#114 - My personal favorite, always blows my mind [+] (34 new replies)||01/21/2015 on Universal thoughts||+146|
#350 - psdeath (01/21/2015) [-]
Imagine you compress a spring. The spring experiences a slight increase in mass, nothing which we can detect without high tech instruments. This increase in mass times the speed of light squared, is equal to the energy put into the spring when we compressed it.
That's kinda what E=mc^2 is about. I'm not very good at explaining, and English isn't my mother tongue, so someone tell me if I got something wrong up there.
#312 - anonymous (01/21/2015) [-]
After the big bang, there was only hydrogen. Those atoms fussed into heavier elements inside stars, thus creating new elements. The hydrogen in your body might be billions years old. The carbon, oxygen and other elements? Not so much. Not as those elements.
#373 - hanabro (01/21/2015) [-]
The new elements are the same exact matter as the hydrogen, but atomically re-arranged. The same amount of mass still exists.
Technically, it's "MASS" can never be created or destroyed, which means that there is a finite amount of stuff that can exist, meaning, in a very loose sense, matter cannot be created or destroyed. It's current form can, but all the matter that was there still exists in a different form. If you burn a log, it's converted into smoke and ash, but there's still the exact same amount of matter.
#356 - psdeath (01/21/2015) [-]
I really need to edit new reaction pics
Even if you were correct, hydrogen is what makes up those other elements, so split them all up and we're basically made up of only hydrogen, which age dates back to the big bang. The point of the picture is to say that while we as beings are not that old, the components we're made of are as old as the universe.
#412 - coolcalx (01/22/2015) [-]
the Big Bang Theory is the result of the phenomenon known as redshifting.
All galaxies outside of our local group are redshifted, and therefore travelling away from us. All of them.
this implies the universe is expanding, which in turn implies that the universe originated from a singularity (the result of playing the universe's expansion in reverse).
main sequence stars like our Sun don't have enough heat to fuse atoms (the heat is in fact three orders of magnitude too low), but are able to do so through quantum tunneling.
fusion cannot create energy in elements heavier than iron (just as fission cannot create energy from elements lighter than iron). The reason stars can't produce heavy elements is due to the fact that gravitational pressure would crush them REGARDLESS of their temperature. Heavy elements are created when large stars collapse, resulting in a powerful shockwave explosion known as a supernova (side note, this is the most energetic phenomenon in the universe).
no heavy elements come from the Big Bang. the Big Bang produced hydrogen, helium, and a little lithium. main sequence fusion created everything up to iron, and everything after that is the result of stars collapsing and exploding.
#413 - psdeath (01/22/2015) [-]
I am shocked. Mainly because this sounds scientific as shit and completely valid, but also because of all the bullshit I've been spoon fed from a source I can't remember. It wasn't some bullshit source though, I just can't put the name of the scientist in my head.
But I guess I learn something new every day. I did know about the expansion of the universe though, and the whole thing playing it in reverse.
#420 - psdeath (01/22/2015) [-]
Bad news? My friend, you bring me knowledge, the only known cure for ignorance! That's good news. I mean, I just seem to have overlooked this part completely. Otherwise I consider myself at least somewhat above average when it comes to knowledge about space. Personal favorite space phenomenon (or what ya call it) are quasars and/or blazars.
Also, sorry but I have 1.0 AM humor and can't get over that fact that you're graduating with a BS in physics. Bullshit physics sounds like an accurate description of quantum physics though, that shit's magic. But on a serious note, that's awesome. We need more astro physicists in this world, gotta get them humies on mars.
And alright, I don't think I have any questions but thanks! I'll continue on a quest to cure any further ignorance.
#131 - coolcalx (01/21/2015) [-]
matter can totally be destroyed and created. it's energy-mass conservation that really matters.
for example, if you wanted to calculate all of the positive energy in the universe, you do a simple E=Mc^2 calculation, where M is the total mass of luminous matter in the universe. this comes out to about 9*10^69 joules (if we assume mass=10^53 kg, which is within 2 orders of magnitude of most current theories)
But this number doesn't include the energy of photons and neutrinos, which are massless (neutrinos are essentially massless), so you would do E=pc, where p is the average momentum. I have no idea what that value is, but it would would add considerably to the other energy calculation.
this means the universe has 70 magnitudes of joules worth of energy, right?
well... certain energy fields (namely, gravitational) produce negative energy. It turns out that the value of the negative energy may exactly balance out the value of positive energy, producing a zero energy universe.
#154 - coolcalx (01/21/2015) [-]
the metric expansion of the universe is a general property of the universe which takes place only on a global scale, rather than a local one. in local space, systems are gravitationally bound. this is not the case for areas outside major centers of gravitational attraction. (you know. dark space. where the reapers are)
#134 - anonymous (01/21/2015) [-]
#411 - coolcalx (01/22/2015) [-]
incorrect. the energy release is due to the mass difference between the product and the reactant. In fusion and fission reactions, mass is not conserved, and the difference in mass is explained through mass-energy equivalence: E=MC^2 and the energy is released in the form of gamma rays and neutrinos.
#256 - tehcookee (01/21/2015) [-]
here is a basic explanation:
matter and energy can be converted between each other, thats what the equation "E=MC^2" is talking about (energy = mass * speed of light^2)
This most commonly occurs in Nuclear Fusion (the reaction that stars and our best bombs use) when two individual protons (hydrogen) fuse together into one nucleus (hydrogen); a very tiny amount of the mass is converted into a metric-butt-ton of energy...
Anti-matter also does this when is comes into contact with regular matter and ALL of the combined anti/matter turns into energy
#139 - timeiskey (01/21/2015) [-]
organic compounds and such
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