davewhite04 said:
This was the only downside of your post, personal attacks based on I don't know what. I admit I'm not a qualified scientist, but I have a little knowledge that is all. I did not state that stars are made of light, I was trying to explain the need for a stars rays in simple terms. This is a religious forum after all and not science.
Given the tone of the rest of my post, I regret having written one part in a seemingly derogatory manner.
davewhite04 said:
Silas said:
The Second Law of Thermodynamics is immutable - one day all the possible sources of energy will be drained and the Universe will flatten out to a uniform temperature, and will effectively die (unless there's enough gravitational energy to cause the Big Crunch), but the visible Universe would have very different properties if that was even remotely imminent. There is very clearly billions upon billions of years to go. Even our own Sun is not yet half way through its lifespan, and in 7 or 8 billion years it will also expand to a red giant and explode, throwing out all the elements that formed it and the rest of the solar system, to create new stars, new systems ... and maybe new people.
So essentially the universe is in decline, I mean it's not getting any younger is it?
Well.... in that sense the Universe has been in decline since one second after the Big Bang! You were claiming that with the Universe in decline there wasn't energy to create any more stars, and I was pointing out that not only is that not the case, but that new stars will be born from the debris of our Sun when it has lived out its life. And that the atoms that form your body and my body may, billions of years from now, form part of the body of some future alien.
I'm not a qualified astrophysicist, and I'd hate to think that it would take an astrophysicist to understand the basic facts that the bulk of star-stuff is hydrogen, that there's lots of hydrogen in space, that the Universal force of gravity will inevitably form conglomerations of hydrogen. I only need to stretch an elastic band or a piece of saran-wrap to understand instinctively how moving atoms around creates an increase in temperature, and given enough hydrogen the pressure and temperature at the centre of the conglomeration of hydrogen will suffice to start a nuclear reaction. The continual creation of new stars is inevitable, and I really don't think that
is over your head, as you put it. The precise mathematical detail of the quantum physics describing exactly how two hydrogen nucleii fuse to form helium (and larger) atoms undoubtedly is over your head, as it is over my head, too.
davewhite04 said:
I mean if 10 stars die and 2 are born then how come we still have stars if the universe was eternal?
Before the Big Bang theory, Fred Hoyle theorised that matter was being constantly created (one particle at a time), and that was sufficient to maintain the so-called "Steady State Universe". As I've said some form of matter creation is theorised anyway. There's certainly no reason to suspect (with the Universe in its current state) that the rate of star creation and destruction is that far out of balance in
either direction.