(HD)Sun Hidden Secrets - End Of The Sun -HD documentary2015|national geographic 2015

• Report rights infringement
• published: 22 Jul 2015
• views: 777

(HD)sun hidden secrets - HD documentary2015|national geographic 2015 Don’t forget to subscribe our channel for more awesome videos, Try to follow us on social media, we’re here 7/24 , happy to serve you: Facebook: https://goo.gl/gTez1P Twitter: https://goo.gl/TZmnRC Google+: https://goo.gl/Qdl9b8 The End Of The Sun The Helium Flash The beginning of the end for a red giant the mass of our Sun occurs very suddenly. As the helium "ashes" continue to pile up at its center, a higher fraction of them turn electron-degenerate. It is an odd paradox: even as the outer layers of a red giant star are expanding into a huge but tenuous cloud, its inner core is contracting down to form a buried white dwarf. The temperature and pressure in the Sun's core will soar to 10 times their current values. And roughly 1.2 billion years after it leaves the main sequence, at the height of its glory as a red giant, the center of the helium core of the Sun will become sufficiently massive, dense, and hot that something amazing will happen: within a matter of minutes, it will ignite and burn. When the temperature in the core reaches about 100 million degrees, the helium will begin to fuse into carbon by a reaction known as the triple-alpha process, because it converts three helium nuclei into one carbon atom. This generates a great deal of heat. However, unlike when the Sun was young and its core contained normal matter, adding more heat to the electron-degenerate helium does not cause it to expand and cool. As I noted when I was discussing quantum mechanics, electron-degenerate matter behaves more like a liquid than a gas when you heat it: its temperature swiftly rises, but it doesn't expand. In other words, the self-regulating mechanism that keeps main-sequence stars so stable (hydrostatic equilibrium) is turned off in electron-degenerate matter. If you add heat to a white dwarf, it just gets hotter. As it happens, the triple-alpha process is exceptionally highly temperature dependent: doubling the temperature of the reaction causes it to run roughly a trillion times faster! So, as the fusing helium heats the core, which cannot expand to cool down, the increased temperature causes the helium fusion to suddenly proceed millions of times faster, which very rapidly heats the core even more, which in turn causes the helium to fuse way, way faster . . . In short, the center of the helium core explodes. About 6% of the electron-degenerate helium core, which by now weighs in at about 40% of a solar mass, is fused into carbon within a few minutes. (This corresponds to burning roughly ten Earth masses of helium per second, if you are keeping score.) For obvious reasons, astronomers call this the helium flash. In roughly the time it takes to toast a bagel, the flash releases as much energy as our current Sun generates in 200 million years. At the height of the flash, the Sun's core will very briefly equal the combined luminosity of all the stars in the Milky Way galaxy! One might imagine that a conflagration of this magnitude would have a dramatic impact on the red giant – and it does, in a way, but not nearly so suddenly or violently as you might think Mysteries of the Sun is a collection by the American Jazz performer Sun Ra and his Solar Arkestra. The collection is viewed as one of the more available recordings from his "Sunlight based" period. Initially discharged naturally Saturn mark in 1965, the record was occupied for a long time before being reissued on smaller circle by Atavistic in 2008. 'Denoting a move in its improvement between the propelled swing of the early Chicago-time recordings and the expanded freestyle experimentation of its New York residency, this collection likewise uncovers the initially recorded renditions of two Ra models, "Well disposed Galaxy" and "Love in Outer Space." Accessible, yet segueing into vanguard domain, this collection highlights a ripe period in the Arkestra's history. Looser and more forceful than its Chicago recordings, these pieces discover the Arkestra pushing at the points of confinement of congruity and tonality.' Troy Collins Read and watch out more on these sources: Source: http://goo.gl/vAm3ia Source: https://youtu.be/GYoBIlZhrMI Find out more about documentary and documentaries also documentaries 2015 on our channel that share videos from bbc documentary, national geographic,pds documentary, You can also read: Keyword,Documentary,documentaries,national geographic,bbc documentary. Sun Hidden Secrets End Of The Sun