Q. 152. Define a light year.
Q. 153. What are galaxies? Write the name of different types of galaxies.
Q. 154. How many constellations are recognized so far? Describe be the main constellation such as: Ursa Major, Ursha Minor, Orion, Scorpio, Pleides.
Q. 155. Differentiate between galaxies and constellation.
Q. 156. Differentiate between stars and planets.
Q. 157. What are asteroids?
Q. 158. What is correct? Name the periodic correct that appears after a fixed perids.
Q. 159. What are meteors? How do they become visible?
Q. 160. What are meteorites? How do they differ from meteors?
Q. 161. How is the age of solar system estimated?
Q. 162. Differentiate between stars and shooting stars.
Q. 163. Explain briefly the formation of earth.
Q. 164. Explain the structure of the various layers of earth. Draw a diagram showing the various layers of the earth.
Q. 165. What is the proof that our universe is expanding?
Q. 166. What is a satellite? Describe different types of satellites giving suitable examples.
Q. 167. What is a geostationary satellite? Give its two applications.
Q. 168. State the areas in which space technology finds applications.
Q. 169. Explain the importance of stars for the people in ancient limes.
Q. 170. Write full form of NASA.
