4. A 'black hole' is a body in space which does not allow any radiation to come out. This property is due to its?
5. A celestial body consisting of a gaseous cloud enveloping a bright nucleus moving around the Sun in an elliptical or parabolic orbit so eccentrically that some escapes from the Solar Systems is called?
6. A celestial body having its own heat and light is called?
7. A celestial body which revolves round a planet just as a planet revolves round the Sun is called _____.?
8. A celestial body which revolves round the Sun and receives heat and light from it is called _____.?
9. A family or system of millions and millions of stars are called ____.?
10. A leap year consists of?
11. A Light Year measures?
12. A meteor is?
13. A swarm of small bodies in between the two Planets of Solar System is called 'asteroids' which are those two Planets?
14. A system of millions and millions of galaxies are called _____.?
15. All asteroids collectively revolve around the?
16. Among the following which planet takes maximum time for one revolution around the Sun?
17. An ancient star that has collapsed matter so dense that It creates gravitational force so powerful that even light also does not escape. It Is called?
18. An imaginary belt of 12 constellations or group of stars la called?
19. Arrange the Inner Planets in decreasing order of their distances from the Sun. 1. Earth 2. Mercury 3. Venus 4. Mars 5. Neptune?
20. Arrange the Outer Planets in increasing order of their sizes. 1. Jupiter 2. Uranus 3. Saturn 4. Neptune?
21. At present how many planets are in existence is visible?
22. Average density of the Earth is ( relative to water) __.?
23. Average temperature of the Earth is.?
24. Bhabha Atomic Research Centre is situated in……