Explain why the Earth spins like a top and Uranus rolls like a ball. 

What is the name of $400 \mathrm{km}$ thick bright layer around the sun?

What is an artificial satellite? Name any two types of artificial satellite and state their functions.

Which of the following is not a natural satellite?

Which satellite is used for geographical survey?

Why do tail of comets formed, when it comes closer to sun?

The smallest planet in the solar system is _____. (Mercury/Neptune)

Fill in the blank with a suitable word:

(equator, Saturn, galaxy, crust, star)

The planet _____ has many gaseous rings around it. 

Identify me.

I am a planet that takes the shortest time to go around the Sun. I am _____.

Which of the following planets have rings around it?

Choose the correct word given below and fill in the blank.
(Moon, eight, stars, Milky Way, Mercury)
_____ is the planet closest to the sun.

Which of the following planets do not have natural satellites?