Sun, Science

The Sun is the most  important star from our point of view.  It is the only star close enough to be studied in considerable detail. The grandeur of  the Sun is partly because of  its size. Its diameter is almost  110  times that of  the Earth. We can best visualise the volume of  the Sun if we realise  that more than a million earths can be dropped into the space it occupies. As we have said above, the mass of  the Sun is about 2 X 1033 grams, which makes it more than 300,000 times  the mass of  the Earth. The average density of the Sun, i.e..  its mass per unit volume, is about 1.4 g/cm3. 

 

1171_Sun.png

Although the Sun appears to be unchanging, it  rotates about  its axis once every 25 days. From time to  time dark patches appear on the surface of  the Sun, usually in pairsor in groups. These dark patches are called sunspots. Their movement  is an indication of  the Sun's  rotation. This fact was recognised  for the first tiine by Galileo. Actually, a sunspatis  a regiim cn  the surface  of the S&  that consists of gases almkt 10000c cooler than those surrounding the area. The number of  sunspots  increases and decreases in a cyclc every  11  years. In  the long term, there are periods of  low number of sunspots and High'number  of  sunspots.  

Posted Date: 9/28/2012 1:58:41 AM | Location : United States







Related Discussions:- Sun, Assignment Help, Ask Question on Sun, Get Answer, Expert's Help, Sun Discussions

Write discussion on Sun
Your posts are moderated
Related Questions
A weather picture A piece of white blotting paper is immersed in a solution having two parts cobalt chloride to one part common salt. While wet the paper will stay pink, but wh


Define the Mechanism of Hormone Action Hormones affect cell function either by activating cyclic AMP (Adenosine monophosphate) mechanism or by activating genes. You may recall

Excretory Function of Bile Excretory function: Bile pigments (bilirubin and biliverdin) are the waste products of the breakdown of red blood cells and bile is their route of ex

Are spatial and temporal scale important considerations in relation to

How can percentage of solid particle been calculated The percentage of solid particles and pore space in a soil may be calculated from the bulk density and particle density if

Explain Intermittent positive pressure lung inflation When medulla is affected, the cough reflex may be lost. To prevent secretions entering the lungs, a tube is inserted into

How soil textural classes categorised and what are is their significance? The soil textural classes are based on the percentage of the separate(s) which contributes maximum to

1. A cyclist ascends a hill of height 120 meters. The mass of cyclist plus bicycle is 100 kilograms. His efficiency is 25%. How many Calories does he burn? 2. A hiker in the Swi

FIRE HAZARDS IN THE LABORATORY : The average science laboratory is a particularly hazardous area when it comes to fire. Flammable liquids, compressed and liquefied gases, hazard