Good question as entropy is important.Amazing answers to a seemingly simple question, thank you everyone.
However is there not an entropy dilemma here?
Doesn't entropy either remain constant or increase?
The formation of new stars from potential energy of gravitational collapse is that an increase or decrease in entropy?
I welcome all responses.
I'm unclear how the FoV (Field of View) will help us see regions near or exceeding the speed of light. Do you mean the HST's light gathering and resolving power? The James Webb is our next big step for this.There is a field of view of the Hubble (telescope). Since the universe is expanding at a speed higher than the speed of light (does not contradict SRT), then in theory we should not see new stars, i.e. photons and other particles must move away and will not come out to fix them. But at the same time, Hubble's field of view also expands, which makes it possible to catch a particle or a whole stream. This particle can serve as an identification mark for a star or even a galaxy. Not entirely new, but for us, it was recorded for the first time. Somewhere there was nothing, and then something flies in from there. That is, the field of view of our most powerful telescopes and sensors is far from the entire universe. And over time, more and more discoveries take place. And will be.
Pretty much all the mass was created at the BB, but mostly in the form of hydrogen and helium with a bit of lithium as gas and dust. Today, there is still much gas and dust out there, and stars are still being born.
That's interesting, but I would guess that most mature BHs have exhausted the accretion gas, thus wouldn't be so hot.I was watching a very interesting program on BBC that hypotheses' that mature black holes inhibit the birth of stars because the event horizon is so hot that it prevents gases from coalescing into the necessary masses needed for star formation.
That makes sense because some sort of disturbance is required to trigger cloud collapse. Normally it is either supersonic flows internal to the cloud or nearby SN. Perhaps BH's that pass through town are enough to trigger collapse, though I would think they would have to be fairly massive.Younger black holes on the other hand actually participate in star formation by sparking the star process through speeding up mass formation through the exertion of gravity.
I don't understand their reasoning. I thought the MW is now more mature and without much fresh gas (GMCs) to have the formation rate it once had. Do BH's change this, somehow?This is given as the reason for the slow star formation rate in the milky way, about one star a year!
I suppose what everyone is banking on is energy. The tremendous energy that accompanied the Big Bang made everything else possible. If the next question is "Where did the energy come from, at least one can reply, "From the Big Bang!"If you assume a start of the universe.
The question is, where did matter come from?
How did it transform?
Nucleosynthesis from the theory of the Big Bang can be explained as a part process in isolated cyclic events.
I don't understand their reasoning. I thought the MW is now more mature and without much fresh gas (GMCs) to have the formation rate it once had. Do BH's change this, somehow?
The MW, however, doesn't seem to have an active accretion disk around the central BH. We now have time lapse images (video) of stars quickly orbiting the BH, so I assume we would have detected any active disk. Even if stars formed like this, wouldn't they just form a multiple star system, never leaving their host. I would think these protostars and stars would tend to have orbital decay due to disk interaction, thus have short lives.As I understand it; there is a super massive black hole at the centre of the milky way with a mass that is about 4 million times that of the sun, the resultant gravitation pulls stars and other galactic matter into its accretion disc, superheating it and inhibiting the formation of stars. I suppose this must still be a theory, although the program did claim that there was recorded proof of this process taking place.