The Free Dictionary  
mailing list For webmasters
Welcome Guest Forum Search | Active Topics | Members

The Solar Core Options
Daemon
Posted: Monday, December 24, 2018 12:00:00 AM
Rank: Advanced Member

Joined: 3/7/2009
Posts: 27,166
Neurons: 80,676
Location: Inside Farlex computers
The Solar Core

The Sun converts five million tons of matter into energy every second by nuclear fusion reactions in its highly compressed core, producing neutrinos—subatomic particles with extremely low mass—and solar radiation. The small amount of this energy that penetrates Earth's atmosphere provides the light and heat that support life. The temperature of the solar core is close to 27 million degrees Fahrenheit (15 million degrees Celsius). How hot is the surface of the Sun? More...
KSPavan
Posted: Monday, December 24, 2018 2:25:46 AM

Rank: Advanced Member

Joined: 1/28/2015
Posts: 5,840
Neurons: 3,083,843
Location: Kolkata, Bengal, India
Article of the Day
The Solar Core
The Sun converts five million tons of matter into energy every second by nuclear fusion reactions in its highly compressed core, producing neutrinos—subatomic particles with extremely low mass—and solar radiation. The small amount of this energy that penetrates Earth's atmosphere provides the light and heat that support life. The temperature of the solar core is close to 27 million degrees Fahrenheit (15 million degrees Celsius).
ciqov
Posted: Friday, December 28, 2018 2:36:18 AM
Rank: Newbie

Joined: 12/25/2018
Posts: 2
Neurons: 16
The idea is to provide the knowledge to the students who need this because they are all looking for one thing
thar
Posted: Friday, December 28, 2018 5:16:07 AM

Rank: Advanced Member

Joined: 7/8/2010
Posts: 19,182
Neurons: 77,437
Energy is generated in the core of the sun, by the collision and fusion of hydrogen nuclei to produce helium + energy, but these photons have a hard time getting out of the dense ball of gas. They collide with, and are absorbed by, the other atoms, which then emit a photon in turn. Many millions of times. It has been calculated it takes 10,000 - 200,000 or up to to a million years (depending on who you ask) for energy to move this way from the core to the surface of the sun.
Closer to the surface there is convection so the material moves, as well as the energy being transmitted by collisions, so it takes only 10 days to complete the final 200,000 km to the surface.

By this time all the collisions have reduced the energy of the initial gamma waves and increased their wavelength, so what comes out includes everything from X rays, though Ultra-violet, peaks at visible light, then on down through infra-red to radio waves, but not the original gamma waves produced in the core.
The Sun does emit gamma rays, but they are produced by another process at the surface.

Then the traffic clears and the photon takes only 8 minutes for the 150 million km to reach Earth.

That is the source of the energy, but the photons produced in the core are not the ones that reach Earth.

In contrast, the neutrinos speed through where the photons get stuck in traffic. Because they don't interact with anything, they make it to the surface of the Sun in a couple of seconds, and the same 8 minutes to Earth, since they travel at the speed of light (or so close to it you can't tell the difference. But not faster, whatever the Italians might say). But then they travel right through Earth as well. Right through you. Billions every second. Not just from the Sun, of course, but from everything else that has spewed them out in the universe.

Pretty cool, huh. Whistle



Users browsing this topic
Guest


Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Main Forum RSS : RSS
Forum Terms and Guidelines | Privacy policy | Copyright © 2008-2019 Farlex, Inc. All rights reserved.