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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.
Explain the Common Tests during Pregnancy Pregnancy, as you may have realized, is a period of physiological stress. To ensure a successful pregnancy, few common tests are recom
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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
Q. What are the different states in which water is found during the water cycle? During the water cycle, water is found in solid state (snow, ice, etc.), liquid state (ground wa
Why is olivine a rare mineral in sandstone? a. What is the range in grain size of sample 33 from the Athabasca University Rock Samples Kit? (Hint: Measure the size of the gra
Define the Regulation of Glucocorticoid Secretion Glucocorticoid secretion is mainly controlled by ACTH or adrenocorticotropic hormone from the anterior pituitary gland. In any
PROCEDURE A. For Gas Supply Visit the LPG gas store room 1 cracking plant along with your counsellor or the lab in charge' and note the way supply of gas is regulated. It
Fortin type barometer A simple Fortin type barometer can be improvised for the junior laboratory. The glass tube is held vertically with single end in the reservoir by two curt
what are the reactions taking place during alcoholic acidity estimation for wheat flour
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