Down 

1 .   Which Planet is the hottest in the Solar System?

2 .   Which Planet has a great red spot? 

4 .   Which Planet has the most rings around it?

6 .   What do you call an Alien that is supposed to live on Mars? 

7 .   Which 'Planet' was the last to be found? 

Across 

3 .   Which Planet looks like the deep blue sea? 

5 .   Which Planet was named after the Roman God of War? 

8 .   Which Planet is named after the Roman God of Messengers? 

9 .   Which Planet orbits the Sun on its back? 

10 . This collection of gas is called the Heart N_ _ _ _ _?