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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.
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.
Classification of protozoa up to order
Explain the Filiform papillae These are long and slender and are the smallest of the three types of papillae. They are found to be most numerous on the edges and anterior two t
what is the space that takes up matter
Define Hypovolemia or Reduction in Blood Volume Hypovolemia leads to a decrease in cardiac output, which causes a fall in the systemic blood pressure. Hypovolemia may be produc
Making a 'gusher' with compressed air Secure a large narrow-necked bottle like as is used for soda water. Place a single-hole stopper in the bottle. By the stopper put a 10- cm
International economic order: The developing countries mostly threw off the colonial yoke in the 1940s and 1950s, and ever since they have been struggling to stand on thei
what is an easy way to learn everything about photosynthesis?
In hydraulic machines a liquid that has filled a pipe is pushed at one end of the pipe. The liquid then pushes a machine part located at other end of the pipe. Why isn''t gas used
Explain Fatigue - Respiratory Adjustments Fatigue means a state of decreased efficiency due to prolonged exertion. It may occur due to sustained muscle contraction. The muscles
Explain the Passive Factors or Passive Soil Formers Passive factors are by and large slow acting factors and include parent material, topography and time.
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