The lack of features IS the expensive feature. Because of that the volume is low and the price per unit is higher to make it, I would expect.
It's not free to go to the library. It costs me $3 in gas and wear and tear on my car. And I have to take the books back for the same price. Even with multiple books/trip it still averages over a $1 just to borrow a book.
Exactly! But not just the planets; all objects inside the solar system plus those outside that will be entering over the time considered.
The order is White, Yellow, Green, Blue, Red, Orange, Purple, Brown, Black. I don't know why, I just perceive those colors as those numbers.