Answer:
Solar system is a part of Milkyway Galaxy. 
Explanation:
Mikyway is a Galaxy or we can compare it with a family of many members (collectively) ane Solar system is a part of mikyway galaxy or we can compare it with a member of the family!
 
        
                    
             
        
        
        
I think it’s 15cm 
Might be 7cm
        
             
        
        
        
Electromagnetic waves need no matter to travel - they can travel through empty space (a vacuum). In a vacuum, all electromagnetic waves travel at approximately 3 x 108 m/s - which is the fastest speed possible. ... 
Light traveling value through an optical Fibre is, 2 x 108 m/s. Hope that helps.
        
             
        
        
        
B. It’s the same roughly at all latitudes