Answer:
Its earth and the moon! But no sun?
Explanation:
As you see in the picture its space, but quite different.. It has Earth.. The moon.. but wheres the sun?
First line
e , f , b , a , g , e , c , d , a , b
second line
c , f , g , e , a , b , a , g , d , e
third line
f , g , a , e , f , g , e , f , a , b
if you need more help with music theory let me know!