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Size Comparison: Pluto and Australia (sopuli.xyz)

submitted 2 years ago by Sibbo@sopuli.xyz to c/astronomy@mander.xyz

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[–] Swedneck@discuss.tchncs.de 2 points 2 years ago (1 children)

if anyone wants to do the math, how far away from the sun would the camera have needed to be to take such a photo?

[–] mindbleach@sh.itjust.works 2 points 2 years ago

Apparent scale is inverse linear, i.e., proportional to 1 / distance. If we want the apparent scale of two objects to be about 90% accurate to their actual relative scale, their relative distances to the camera can't be more than 10% different. Pluto being 40-ish astronomical from Earth, you'd want to shoot from about 400 AU. Voyager I should be in prime position circa 2140.