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Mar 26 at 11:01 comment added Christopher Bennett If it's another planet in our reality, odds are it would have different gravity, a different moon or moons (or an absence thereof), a different atmosphere, different plants and animals, etc. that would make it immediately obvious that it isn't Earth. If it's not easily distinguishable from Earth yet exists in a massively different astronomical context, that's getting into isekai territory.
Mar 26 at 9:07 comment added Schmuddi This seems to be a valid scenario that allows the protagonist to realize slowly that they're not on earth (or in the solar system) anymore. But isn't the story requirement that they have to realize that they're not even in our reality anymore?
Mar 25 at 11:54 comment added phoog Urban stargazing: the star is out
Mar 24 at 22:25 comment added Christopher Bennett Good point about a starless night, but it'd only work in the wilderness or a preindustrial city, otherwise the lack of visible stars could just be chalked up to light pollution or air pollution. As for seeing the whole galaxy, remember that the Milky Way is a view of the galactic disk from directly inside it, so a view of it from outside would be dimmer than the Milky Way -- something you'd only see once your eyes adjusted to the darkness.
Mar 24 at 20:52 comment added user109900 good anwer imo, on the other end of the spectrum, having the star system being the most remote of its host galaxy, allowing either almost starless nights or fully populated galactic picture depending on annual orbital position around the star.
Mar 24 at 20:23 history answered Christopher Bennett CC BY-SA 4.0