1.
Which two planets of the solar system have no satellites?

2.
Which planet is known as the Earth's Twin?

3.
The Saturn rings were discovered by ________

4.
The darkest part of the shadow during eclipse is

5.
The planet that is nearly comparable to Earth as regards its size and mass is

6.
Which is the brightest planet of the solar system?

7.
Which is the hottest planet in the solar system?

8.
The period of one revolution of sun around the centre of galaxy is called ________

9.
Comets are celestial bodies moving about the solar system in

10.
The planets are kept in motion in their respective orbits by ________

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