Science & Technology Class 8
Answer the following questions:
1. Why do we find the Sun to be the biggest and the brightest star?
2. Why does the Pole Star appear to be stationary?
3. Draw diagrams of the positions of different stars in Ursa Major and Orion
4. Venus is not the nearest planet to the Sun Then why is it the brightest?
5. How will you recognise the Pole Star?
6. Write the names of the planets as per their increasing distance from the Sun
7. Spell out differences between a planet and a star?
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Answer:1)Ans: the sun appear so large then the other stars because it is closest star to us but other than sun there are many e large and brightest stars.
2)Ans: because it lies most exactly on earth's Northern axis, it's like the hub of a wheel which never moves to other place but rotates in place. As it doesn't raise or set. it is fixed in Northern sky.
4)Ans: Venus is so bright because its thick clouds reflects most of the sunlight that that reaches it (70%) back into space, and because it's the closest planet to the earth.
5)Ans: to locate polaris, all you have to do is to find the big dipper pointer stars dubhe and Merak. these two stars outline the outer part of the big dipper's bowl. simply simply draw a line from merak through dubhe, and go about five times the merak/dubhe distance to Polaris. if you can find the big dipper, you can find Polaris.
6)Ans: in our solar system there are eight planets:
the planets in order from the sun based on the distance are mercury, Venus, earth, Mars, Jupiter, Saturn, Uranus, Neptune.
7)Ans: planets: *planets have low temperature than stars.
*planets are not bright objects.
*planets do not generate their own energy through nuclear reactions.
stars: *stars have high temperature than planets.
*stars are bright objects.
*stars stars generate their own energy through nuclear reactions.
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