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

2. A blackhole is a

3. Asteroids have their orbits between the planets:

4. The brightest star in the sky is:

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

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

7. What are Sun spots?

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

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

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