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"In 2018, astronomers precisely measured the distance to globular star cluster NGC 6397 with Hubble with a method known as trigonometric parallax, which uses straightforward trigonometry, the same method used by surveyors: bit.ly/4fqTJs6 🔭 🧪"

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"Hubble Makes the First Precise Distance Measurement to an Ancient Globular Star Cluster"

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