1. A blackhole is a

2. Stars which appear single to the naked eye but are double stars when observed by a

3. What are Sun spots?

4. Halley’s comet appears once in a period of:

5. Asteroids have their orbits between the planets:

6. The orbits of planets around the Sun, or of satellites around the Earth, can be :

7. To a space traveller on moon, the lunar sky during day time appears:

8. Which one of the following is correct? Great Bear is a :

9. The brightest star in the sky is:

10. The distance between the Earth and the Sun (in million kms.) is :