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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.
Cholagouge action and Absorptive function of bile Cholagouge action: Bile acts as its own stimulus. Bile salts are absorbed from the intestine, carried to the liver and stimula
Intrusion into the Water Cycle: Water management is one of the leading concerns of man today. The natural water cycle has not been able to compensate for the effects of human
what are the solid parts of Earth made of?
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Lasers : Laser light is an extremely intense form of electromagentic radiation and its name is acronym for light amplification by stimulated emission of radiation. Lasers are us
Procedure : A mock fire may be created by spilling a flammable liquid like alcohol, petrol etc. and lighting it at a safe place away from the equipments and working benches. Th
When, in the geological time scale, did dinosaurs first appear: Triassic
Explain Change of posture - Decreased Cardiac Output When a person stands up from lying down posture, there is an immediate but transient fall in systolic blood pressure. This
explain the factors that led to the decline of science in europe during iron age
Define General Hormones General hormones, on the other hand, are emptied into the blood by specific endocrine glands and then flow throughout the entire circulation to affect c
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