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It's a philosophical question really what it means to confirm a distance, but I'm sure that distances to stars are far from groundless speculation.
There's the same problem with all of cosmology. How do you know that the sun is made of hydrogen, and isn't a ball of iron? All you can say is observations are consistent with the theory that it's made of hydrogen.
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[–] svipbo ago
It's a philosophical question really what it means to confirm a distance, but I'm sure that distances to stars are far from groundless speculation.
There's the same problem with all of cosmology. How do you know that the sun is made of hydrogen, and isn't a ball of iron? All you can say is observations are consistent with the theory that it's made of hydrogen.