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“Andrei Linde WHETHER THERE IS an edge to the universe, and what, if anything, might be beyond, are old questions. German astronomer Heinrich Wilhelm Olbers, who lived from 1758 to 1840, pointed out what is now known as Olbers’s paradox: if space has no edge and is infinite and contains an infinite number of stars, the night sky should be as bright as the Sun. It isn’t. He wasn’t the first to worry about that and certainly not the last. Suppose, instead, space is infinite but the number of the stars is not, and the stars are limited to some sort of system ‘inside’ infinite space. That creates another problem: their system will collapse because of their mutual gravitational attraction. Try to solve that by saying that the star system rotates and its centrifugal force keeps it from collapsing, and someone will surely think to ask: In relation to what is it rotating, since it’s the only thing in an infinite universe?
An expanding universe takes care of some of those problems while int...roducing other challenges, particularly to non-expert thinkers: the balancing act summed up in the formula for omega, such proposals as Friedmann’s first model in Figure 6.1 – a universe that is not infinite in size but nevertheless doesn’t have any edges or boundaries in space (though it does in time), and the paradox of something that expands but doesn’t expand ‘into anything’.MoreLess
An expanding universe takes care of some of those problems while int...roducing other challenges, particularly to non-expert thinkers: the balancing act summed up in the formula for omega, such proposals as Friedmann’s first model in Figure 6.1 – a universe that is not infinite in size but nevertheless doesn’t have any edges or boundaries in space (though it does in time), and the paradox of something that expands but doesn’t expand ‘into anything’.MoreLess
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