Original sentence: Such sales are not legally recognised by any nation, however some nations and NASA have recognised the need for regulation of property rights in space due to the absence of such law.The legal issues concerning ownership of extra-terrestrial real estate are still extremely vague.These sales have inspired certain colourful terms, including things like "Moon for Sale"
Edited sentence: In these early stages of speculation about ownership of extra-terrestrial real estate, the legal issues are still extremely vague.Such sales are not legally recognised by any nation, however many nations and NASA have recognised the need for regulation of property rights in space due to the absence of such law.The current popularity of these sales has inspired many colourful terms, including things like "Moon for Sale"