Science & Technology Class 8<br />Answer the following questions:<br />1. Why do we find the Sun to be the biggest and the brightest star?<br />2. Why does the Pole Star appear to be stationary?<br />3. Draw diagrams of the positions of different stars in Ursa Major and Orion<br />4. Venus is not the nearest planet to the Sun Then why is it the brightest?<br />5. How will you recognise the Pole Star?<br />6. Write the names of the planets as per their increasing distance from the Sun<br />7. Spell out differences between a planet and a star?<br />TRY TO DO THESE ALSO
Answers
Answer:
Explanation:
1) The Sun appears so large compared to the other stars because it is so much closer to us than any other star. The Sun is just an average sized star. For example, below is a list of some of the largest stars in our galaxy and how they compare to our Sun: Mu Ce phi - about 1500 times the size of our sun.
2) Pole stars appear stationary from every point on the earth. This is because it lies on the line along the axis of rotation of the earth. The pole star lies above the earth in the north. As we look directly above us, we see the pole star and it appears stationary.
3) The Big Dipper is an asterism in the constellation U rsa Major (the Great Bear). One of the most familiar star shapes in the northern sky, it is a useful navigation tool. (The system actually contains at least six stars, but only two of them are visible to the eye.)
Orion is a prominent constellation located on the celestial equator and visible throughout the world. It is one of the most conspicuous and recognizable constellations in the night sky. It is named after Orion, a hunter in Greek mythology. Its brightest stars are blue-white Rigel and red Betelgeuse.
4) Venus is one of the brightest objects in the night sky. Venus is so bright because its thick clouds reflect most of the sunlight that reaches it about 70% back into space, and because it is the closest planet to Earth. Venus is the brightest planet in the Solar System.
5) To locate Polaris, all you have to do is to find the Big Dipper pointer stars Dubhe and . These two stars outline the outer part of the Big Dipper's bowl. Simply draw a line from through Dubhe, and go about five times the Dubhe distance to Polaris. If you can find the Big Dipper, you can find Polaris.
6) Our Solar System has eight planets which orbit the sun. In order of distance from the sun they are; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto, which until recently was considered to be the farthest planet, is now classified as a dwarf planet.
7) The main difference between stars and planets is that stars have high temperatures compared to planets. Stars undergo nuclear reactions—usually they burn hydrogen in their cores, releasing massive amounts of energy. Planets do not generate their own energy through nuclear reactions.
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