Planets

I orbit a planet what am I?

I am made up of rock and am much smaller than a planet. What am I?

I am made of gas. I emit light and heat. What am I?

I am made up of group of nebulae, billions of stars and their solar systems. What am I?

What is the layer of gas around the earth called?

The hydrosphere is made of water?

(a)  

Order the planets from closest to furthest from the sun.

(a)  

What is the name of the galaxy where the solar system is?

Which is the hottest planet?

(a)  

Pluto is too small to be a planet. What is it?