Imagine in the far future, if we could easily create mass from energy and then used this to seed as many planets as we wanted, only we want them in the goldilock zone. How many earth sized planets could orbit within it without crashing into each other?
About two, if it’s a star like ours. If it’s a hotter and brighter star we could fit more in but further out. We certainly won’t be using the conversion of Energy to Mass to make the planets. You’d need ridiculous amounts of energy just to make one gram. Just take some spare mass from somewhere else.
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