Name the planets which have no Moon.

Name the one planet which have more than 60 Moons.

What is Goldilock zone for life. Name the planet in the Goldilock zone.

Mention the factors which determine whether a planet would have an atmosphere or not.

If humans were to settle on other planets, which of the fundamental quantities will be in trouble? Why?

The mass and diameter of a planet are twice those of the earth. What will be the time period of that pendulum on this planet which is a seconds pendulum on the earth.

All the known planets move in: