Stars.............  

starlight_runner 39F
817 posts
6/16/2005 4:37 pm

Last Read:
6/28/2006 11:37 am

Stars.............

When the sky is clear and we gaze up we can see how small we really are.For up there are other universes other planets and other stars.

But what are we really seeing?

The basic difference between a star and a planet is that a star emits light produced in its interior by nuclear 'burning', whereas a planet only shines by reflected light.

There seem to be an enormous number of stars that are visible to the naked-eye at a really dark site but, in fact, the eye can only see about two thousand stars in the sky at one time. We can see the unresolved light of many thousands more when we look at the Milky Way, and the light of the Andromeda galaxy, which can be seen by the eye, comes from thousands of millions of stars.

The Sun is our own special star yet, as stars go, it is a very average star. There are stars far brighter, fainter, hotter and cooler than the Sun. Basically, however, all the stars we can see in the sky are objects similar to the Sun.

The Sun (and any other star) is a great ball of gas held together by its own gravity. The force of gravity is continually trying to compress the Sun towards its centre. If there were not some other force counteracting gravity, the Sun would collapse. Outward pressure is produced by the radiation from nuclear energy generation in the Sun's interior.

Stars form from concentrations in huge interstellar gas clouds. These contract due to their own gravitational pull. As the cloud gets smaller it loses some of the energy stored in it as gravitational potential energy. This is turned into heat which, in the early days of the embryonic star, can easily escape and so the gas cloud stays cool.

As the cloud's density rises, it becomes more and more difficult for heat to escape and the temperature at the centre of the cloud rises. If the cloud is big enough, the temperature rise is sufficient for nuclear fusion reactions to begin. These generate more heat and the 'burning' of hydrogen into helium begins, as in the Sun. The object is then a main sequence star.

Next time the night is clear go outside and take a look.



MrsGreenhenky 37F

6/16/2005 5:28 pm

Wow thats amazing.Ye learn loads here.


expatbrit49 62M

6/17/2005 8:55 am

LMAO, well you learn somthing new every day.............. Cool Blog idea and, sorry but I have to say it at least once ...... Very Hot profile Pic

Thank You for Your Time and Attention


rm_affbreak 46M
287 posts
6/18/2005 5:52 am

Change your text color. It's a pain in the ass.


EroticallyRapt 55M
336 posts
6/22/2005 12:27 am

Beauty and intellect. Interesting post, starlight_runner.

ER


keithcancook 60M
17718 posts
6/23/2005 11:11 am

"huge interstellar gas clouds"?
I saw them once in 1972.


mnfun952 102M

6/26/2005 3:07 pm

one can't help but be filled with wonder when one glances up at the night sky.

Enjoy your nights!

MnFun


GleesFlakyShawl 50M
1620 posts
6/27/2005 6:59 am

u emit light, so u must be a star


starlight_runner 39F

6/29/2005 6:51 pm

I thank you for your comments, your views and your words.For me this is the important part: that my message can be heard.

Special hugs to expatbrit and a belated thanks for your wisdom on the colors.All the best to you and yours.

Kisses

Star


Become a member to create a blog