The Sun  

starlight_runner 39F
817 posts
6/27/2005 11:39 am

Last Read:
3/5/2006 9:27 pm

The Sun

So much on this earth we take for granted.Even the very fact that the sun will rise each day and provide us with light and warmth.Without it we would wither and die like a plant on a hot day.

The Sun is a very hot gaseous body composed of almost 75% hydrogen and 25% helium. Less than 1% is made up of oxygen and several other elements. The diameter of the Sun is 1,400,000 km (840,000 miles) which is more than 100 times the diameter of the Earth. Its mass is more than 300,000 times that of the Earth with a surface temperature of about 5,500° C.

The source of energy in the Sun is the fusion of hydrogen nuclei (protons) into helium nuclei. In this process a small amount of mass is lost and transformed into energy. This nuclear reaction can only take place in the very hot (15,000,000°C) and dense centre of the Sun. The Sun loses half a million tons every second in this destruction of mass to give energy but will maintain its present output of energy for about 5,000 million years.

The Sun, as seen from the Earth, rotates about its axis once in just over 27 days and its activity rises and falls over an approximately 11 year cycle, producing variations in the Earth's magnetic field and changes in our upper atmosphere (the ionosphere) affecting the transmission of radio waves and therefore worldwide telecommunications. This cycle of activity was discovered by a German amateur astronomer Heinrich Schwabe as a result of observations carried out between 1826 and 1843; within ten more years a relationship had been established.

For this long period of time the Sun is called a main-sequence or G2 star but eventually the hydrogen in the centre will all have been converted into helium. The balance between the force of gravity pulling all the Sun's mass towards its centre, and the force due to the energy in the Sun which pushes matter outwards, will then be upset. The centre will contract and become even hotter while the outer part will expand and become cooler. The Sun will then be brighter, cooler and bigger - a red giant star. Ultimately all sources of energy production will come to an end and the Sun will collapse to become a very small hot object called a white dwarf.

pussinboots4u 50M/47F

6/28/2005 2:18 pm

Amazing and very true that we take things for granted. Thanks for the astronomy lesson!

rm_adoc99 51M
5 posts
6/28/2005 9:36 pm

I live in Thailand. Can we have some touque! a_doc99 of ya hoo

TDandH1960 56M

6/29/2005 5:19 pm

Hey Starlight, you have me worried now, I won't be able to sleep at night, will you come keep me company,LOL. Actually interesting,what a person learns on a blog site, but does the sun affect our sexual desires? Take care. TDandH

starlight_runner 39F

6/29/2005 6:56 pm

Humans spend too long looking down.Looking up really can provide many answers.It doesnt matter where you are in the world adoc.The sun is always

expatbrit49 62M

7/2/2005 5:44 pm

That last comment is not actualy correct is does matter where you are. If you are in the arctic or Antartic when the sun is in the other tropic then the sun is not there. At least our sun is not there.

Thank You for Your Time and Attention

starlight_runner 39F

7/3/2005 9:58 am

Oh expat brains and speedos, how can I make my greivous error up to you?

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