The Earth in the Universe

1 Marks Question

1. Define galaxy. On which galaxy our solar system falls?
2. A giant family consisting of millions of stars and anything between them is called galaxy. Our solar system falls on the Milky Way galaxy.
   More info: Examples of the galaxy: Milky Way, Large Magellanic Cloud, Small Magellanic Cloud, Andromeda Galaxy, etc.
3. What is the meteors shower?
4. The falling of numbers of meteors together is called the Meteor shower.
5. Name the types of galaxy.
6. On the basis of their shape, galaxies can be classified into irregular, spiral, and elliptical.
7. What is a comet?
8. The mass of frozen gases, ice and dust particles which revolve around the sun is called a comet. For example Halley's comet, Temple-Tuttle, Enke, etc.
9. What is a light-year? What is the distance in one light-year?
10. A light-year is a distance that light travels in one year. Its distance is 9.4607 × 10¹²km.
11. What is a fireball?
12. Big and brightly burning meteors in the atmosphere are called a fireball.
13. Which planets do not have their satellites?
14. Mercury and Venus have no satellites.
15. What is meteorites?
16. Meteorites is a piece of rock or metal that falls to the earth's surface from outer space.
17. How many types of meteorites are there? Write their types.
18. There are three types of meteorites. They are stony, iron and stony iron.
19. What is a constellation? Write an example.
20. A constellation is a group of some stars, which do not change their location relative to each other and are always from a fixed pattern. For example Ursa Major, Ursa Minor, Orion, Leo, lion, etc.
21. How many kilometers are there in 1 A.U.?
22. There are 15 crore kilometers in 1 A.U.
23. Write the name of two asteroids.
24. The name of asteroids are: Juno, Vesta, Toro, Pallus, etc.
25. What is a coma?
26. As the comet gets closer to the Sun, some of the ice starts to melt and boil off, along with particles of dust. These particles and gases make a cloud around the nucleus, called a coma.
27. Write the name of the largest satellite of Saturn and name the gas abundantly found in its atmosphere.
28. Titan is the name of the largest satellite of Saturn. The gas abundantly found in its atmosphere is hydrogen and helium.
29. Write the name of a comet which appears in an interval of 76 years from the earth.
30. Halley's comet appears at an interval of 76 years from the earth.
31. What is solar wind?
32. The solar wind is a stream of charged particles released from the upper atmosphere of the Sun, called the corona.
33. What is an asteroid?
34. Small planet-like bodies that revolve around the sun in the form of a continuous belt between the orbits of Mars and Jupiter are called asteroids.
35. What is the main source of heat and light energy of stars?
36. The main source of heat and light energy of stars is nuclear reactions going on deep inside the stars.