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

The answer to this "Fun Equations of Mathematics", can be viewed by clicking on the button. Please do give your best try before looking at the answer.

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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