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<blockquote data-quote="trancejeremy" data-source="post: 2984489" data-attributes="member: 924"><p>Personally, I think you would use radio astronomy, not visual, to figure out where you were. For outside the galaxy, quasars. Inside, there's a number of unusual objects that you could probably spot fairly easy if you look at various different wavelengths. </p><p></p><p>Parallax is just the difference in angle between viewing distances, period (like if you look through one eye, then the other). Anyway, given the large distances, the parallax might not be obviously noticeable, but it is still finite and measureable.</p><p></p><p>The ancient greeks didn't think stars were far away because they personally couldn't notice any parallax from them (when the earth is on opposite sides of the sun), but that's because their technology just wasn't good enough to measure it.</p><p></p><p>You probably could use it to figure out where you are, but it would be too time consuming, as there are a heck of a lot of normal stars in the galaxy, but only a relatively small number of unusual objects</p></blockquote><p></p>
[QUOTE="trancejeremy, post: 2984489, member: 924"] Personally, I think you would use radio astronomy, not visual, to figure out where you were. For outside the galaxy, quasars. Inside, there's a number of unusual objects that you could probably spot fairly easy if you look at various different wavelengths. Parallax is just the difference in angle between viewing distances, period (like if you look through one eye, then the other). Anyway, given the large distances, the parallax might not be obviously noticeable, but it is still finite and measureable. The ancient greeks didn't think stars were far away because they personally couldn't notice any parallax from them (when the earth is on opposite sides of the sun), but that's because their technology just wasn't good enough to measure it. You probably could use it to figure out where you are, but it would be too time consuming, as there are a heck of a lot of normal stars in the galaxy, but only a relatively small number of unusual objects [/QUOTE]
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