Which is the hottest planet in the solar system?

In which century the early attempt of estimating the size of the earth was made ?

Who was the first to circumnavigate earth?

The weight of a substance is related to the effect of force of ------- on that substance.

What is the average speed of the revolution of the Moon around Earth?

When lunar eclipse occurs the shadow of earth falls on -----------

Which is the only natural satellite of earth?

Polestar appears vertically overhead at the ----------- .

The layer of water on the surface of Earth is called --------

Which position does the Earth stands in terms of size in our solar system?