I don't think we need this argument about reality in the game too..
After all the sun is approx 1.3 million times the size of the Earth, and about 150,000,000 km/ 91,000,000 miles away on average.
So could you imagine trying to create a game based upon the science and the pure sizes of objects of everything with distance? Once again it's a game, it gives simple representations of objects not based on scientific fact, it's just based in space.
Why don't we just let the game be what it is, and leave the studying for school, and just enjoy it for what it is