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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 Antibodies Antibodies (also referred to as immunoglobulins and garnmaglobulins) are produced by plasma cells. They are Y-shaped proteins that each respond to a specific
Objectives After performing the activities under this exercise you should be able to: 1. Calculate the current drawn by a given instrument/equipment /appliance and suggest a
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
Scientific approach to problem solving: The scientific method and the features of scientific knowledge described above are in no way restricted to the domain of scientists alo
When does an atoll start to form? This starts to form when tiny marine animals - coral polyps - attach themselves to rocks on the seabed.
Types of Diseases As we have indicated above. there are diseases,that a person is born with, for example, a baby may have a defective heart at the time of its birth. Then t
To feel the 'spring' of air Secure a bicycle pump and place your thumb over the finish of the outlet tube. Next push the piston in forcibly and rapidly let go of it. What happe
Chemistry in golden era: Chemistry In the field of metallurgy too we notice some remarkable developmenk. Before the close of the sixteenth century, zinc was isolated by a pr
Define the Peripheral Nervous System The peripheral nervous system or PNS, is a part of the nervous system and consists of the nerves and neurons that reside or extend outside
how does pulse rate increase?
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