How NASA Measures Stars

The video explains various methods to measure distances in space, starting with the parallax method for nearby stars, which uses Earth's orbit and trigonometry. For stars beyond 400 light years, the main sequence star method is used, relying on brightness and color. Cepheid variables help measure distances to other galaxies, while Type 1A supernovae are used for even greater distances, up to 13.2 billion light years. Each method has its limitations and accuracy levels, but they collectively allow scientists to estimate cosmic distances.

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