Beelen, J. Black, S. Curran, C. Horellou, S. Aalto, F. Combes, M. Guelin, C. ScienceDaily, 23 January How the universe has cooled since the Big Bang fits Big Bang theory. Retrieved October 25, from www. This is the first time such a close grouping has been seen so soon Even though they are not orbiting an atomic nucleus, they are still restricted to having specific amounts of energy.
The other law of quantum physics that we care about right now is the Pauli exclusion principle , which states that two identical electrons cannot have the same location and occupy the same energy level. Why do they spin? How the heck does spinning in the same direction make them identical? Quantum mechanics is a strange world where all the physical laws we know and love just seem to break down for the heck of it.
What I do know is that electrons can only spin one of two ways. They can have their choice of energy levels. Suddenly electrons no longer have a choice of energy level. These electrons are effectively locked into their energies, which correspond directly to their speed of motion yes, kinetic energy still applies. Like, ridiculously hard. Believe it or not, degenerate matter is harder to compress than the toughest of hardened steel.
It still counts as a gas, because states of matter are defined only by the thermal energy of their particles. And degenerate matter has a crap ton of energy.
The nuclei, however, control the temperature of the gas. They can move however the heck they want, and have any amount of energy. That means that while the pressure of degenerate gas is next to impossible to change, the temperature can be driven up easily. What happens next for the star? What are the consequences of a degenerate core? Like Liked by 1 person. Thank you so much, that means a lot. I can absolutely recommend you a telescope!
In my opinion, the best scope for beginners is an 8-inch Dobsonian. Dobsonians also have mounts that make for the best and easiest setup, use, and takedown. This is cheap as far as telescopes go, and is a very good deal considering all the benefits that come with 8-inch Dobsonians. Orion sells a number of well-priced Dobs, and you could also go with Celestron, but this is the product I would recommend the highest.
Like Like. You are commenting using your WordPress. You are commenting using your Google account. The extent to which this happens depends on the mass of the star. In low mas stars say less than about 2 solar masses , the core can become highly degenerate before ignition, and this results in a runaway process called the "He flash", which causes a drastic core expansion and cooling. In higher mass stars the He ignition proceeds towards a stable equilibrium in a much smoother way.
I found this plot from a thesis by Gautschy , which shows the evolution of the star in the central density vs temperature plane. The He flash takes place in the core of the low 1. The core expands, drops in temperature and density, before recovering and rising to point C which marks stable He core burning. At the same time the luminosity of the star falls because the H-burning shell is pushed outward and extinguished. The higher mass star does not have a highly degenerate core and expands more smoothly and slowly as He ignition takes place.
Its core temperature gradually rises at almost constant density before expanding and cooling a little before settling onto the He core-burning horizontal branch. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Why doesn't a star's core cool down when it expands as a red giant?
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