Fun Mathematical Algebraic Equations with a Cosmic Twist

This fun mathematical algebraic equations puzzle is for school students. Can you solve the given math equations to find the number replacing the question mark?

Fun Mathematical Equations: Explore Astronomy in Math

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The answer is 890
Let me use the following notations for the figures 
S........ Star 
M........Moon 
R......Rocket 
Given: S+R+M = 60.....
(1) R+M = 50.........
(2) M-S = 20........
(3) substituting value of R+M from (2) to (1) S+50= 60, 
S=10 Substituting the value of S in (3) M= 30. Substituting value of M in (2) R=30 Therefore, R x R -S= 30x30- 10= 900-10=890

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