Stars and the solar system Worksheet-8

Stars and the solar system Worksheet-8

1. Name the constellation that can be seen during the winter.

2. Name the instrument you will use to observe rings of the planet Saturn.

3. Which star appears to remain fixed to us ? What is / are the name/s given to it?

4. Name the two natural satellites of Mars.

5. Name any two constellations that have seven prominent stars in them.

6. Define the term 'Constellation'.

7. Name the planet that was predicted before it was actually observed.

8. Why the stars are not visible during the day?

9. Name any two Jovian Planets.

10. In which part of the sky can you find Venus if it is visible as an evening star?

11. What is full moon day?

12. When is the new moon day?

13. Can you see the back side of the moon from the earth?

14. Does the moon have atmosphere and water?

15. Can you hear sound on the moon?

16. Define period of revolution of a planet.

17. Why do the planets not collide while revolving around the sun?

18. Define period of rotation of a planet.

19. Is the earth a satellite of the sun?

20. Why is it difficult to observe Mercury?

Answer:

1. Orion.

2. Telescope.

3. Polestar appears to be fixed. Its name is Dhruv Tara.

4. Two natural satellites of Mars are Phobos and Deimos.

5. Ursa major and Ursa minor have seven prominent stars in them.

6. A group of stars that appears to form some kind of pattern that appears to resemble some familiar shape.

7. Pluto.

8. The stars are not visible during the day because of the glare of bright sunlight.

9. Jupiter and Saturn.

10. Venus appears in the western sky as an evening star.

11. The day on which the whole disc of the moon is visible is known as the full moon day.

12. On the fifteenth day after the full moon day when the moon is not visible is known as new moon day.

13. No.

14. No.

15. No, we cannot hear sound on the moon because it doesn't have atmosphere.

16. The time taken by a planet to complete one revolution is called its period of revolution.

17. Planets move in their own orbits, so they don't collide with each other.

18. The time taken by a planet to complete one rotation is called its period of rotation.

19. No, even though the earth revolves around the sun but it is not a satellite of the sun, because satellites revolve around the planets.

20. Mercury is the closest to the sun, so it is hidden by the glare of the sun. So it cannot be seen.