The Big Bang and Conservation of angular momentum??

Hi Dennis, Careful. You will find yourself contradicted by all physics books and reality on this one. The weight will travel in a trajectory tangent to the circle in the position it was in when released. It will not continue to circle at all. Just try it. Trust me. Mass causes gravity. But we don't need to know the details. All we need to know is that gravity is what causes gas clouds to collapse. Careful. lyx2no is one of the most intelligent posters on this forum, but he will not hesitate to write something witty and demeaning in response to your post. Obviously what he meant was that talking about the big bang is irrelevant in discussing the specific mechanics of solar system formation. Just like it's irrelevant when discussing the aerodynamic properties of a beetle's wings.Welcome to EvC.-MeldinoorEdited by Meldinoor, : No reason given.Edited by Meldinoor, : No reason given.

Hi Dennis, I'm aware of suggestions that supernovae explosions and radiation pressure help to push gas together until gravity becomes strong enough to eventually contract it and begin nuclear reactions. As far as I know, nobody denies that gravity plays the most important role in star formation. Do you have any sources verifying your claim? Two metal balls in a lab will attract each other gravitationally. By using this knowledge, the gravitational constant was determined by Henry Cavendish in 1798. In other words, we've known since 1798 that mass creates gravitational fields. (Actually Newton knew that way before Cavendish) LinkGo right ahead. I challenge him on his beliefs whenever I think he's wrong. Just don't write anything stupid, and above all, don't go spouting ad hominems. I'm not sure I agree that radiation is required for star formation. But the first radiation would have appeared with the Big Bang, and early cosmic background radiation can in fact be seen as radio waves to this day. The first stars formed because the universe, even early on, was not completely uniform, but had matter spread out somewhat unevenly. See the discoveries of COBE that demonstrate this. The first stars formed through the gravitational contraction of the denser regions of matter.Respectfully,-MeldinoorEdited by Meldinoor, : No reason given.Edited by Meldinoor, : No reason given.Edited by Meldinoor, : No reason given.

Indeed, radiation can help trigger a collapse of a star, as I suggested. That still doesn't negate the fact that gravity is what's responsible for the accretion of sufficient matter to ignite nuclear fusion. Radiation may very well play an important role in triggering star formation, but without gravity, it wouldn't be able to produce a single star. Well yes. Mass responds to the force of gravity, but mass will also exert a gravitational force on other masses. Like the two balls that attract each other. It's not just planets that attract mass. Every molecule in my body is currently attracting every molecule in your body with a teeny tiny gravitational force. All mass in the universe attracts all other mass in the universe with a force proportional to the mass and inversely proportional to the distance between the masses squared. This has been demonstrated since the days of Newton. An ad hominem is when you attack the person instead of the argument. Calling someone an idiot, for instance, does nothing to discredit their argument, and will only make you appear weak and desperate. This is a hobby for me too, although I'm here mostly to learn from the experts and to learn to understand other points of view. Attempting to change people's minds by simply asserting things and calling them names never works, and I recommend that you slow down a little bit, read up carefully on the subjects that you're debating, and always provide sources. As you did very well with regards to Cepheus B. CMB radiation is ubiquitous and in the low-energy radio-wave part of the electromagnetic spectrum. Stars, on the other hand, that radiate upon a portion of a gas cloud, can push the gases in the cloud to create dense areas more favorable for star formation. CMB doesn't have this effect because of the low energies and the fact that it doesn't produce a differential effect on a gas cloud. All portions of the gas cloud get about the same amount of CMB radiation. At least I think that's a pretty good way of explaining it.Respectfully,-Meldinoor