1.
The smallest planet in the solar system is
Answer : C. Mercury
2.
A meteor is
Answer : B. a piece of matter which has entered the earth's atmosphere from outer space
3.
The colour of a star is an indication of its
Answer : D. temperature
4.
One astronomical Unit is the average distance between the
Answer : A. Earth and the Sun
5.
Day and night are the result of
Answer : A. earth's rotation around itself
6.
Hubble' is
Answer : C. A space telescope