Why Is Our Galaxy Shaped like a Spiral?
A galaxy is a huge number of stars grouped together. Our galaxy contains about 1,00,000 million stars. It looks like a disc with a flat center and spiral arms. From the...
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What Is Ultraviolet Radiation?
What Is Ultraviolet Radiation? Ultraviolet radiations are electromagnetic rays which are like light rays, but are not visible to the human eye. It is a part of the...
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