Measuring the distance to far away objects in space can be tricky. We don't even know the precise distance to even our closest neighbors in the universe—the Small and Large Magellanic Clouds. But, we're starting to get to the tools to measure it.
Astronomers only knew of a single binary Cepheid system—they just found nine more retrieved 29 March 2024 from https://phys.org/news/2024-03-astronomers-knew-binary-cepheid.html
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