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SkyLabs - From Figure (2/2), the relation of the parallax angle p, the Earth–Sun distance 1 AU, and the distance of the object is sin p = 1 AU/d. Assuming p is
Light year, light second calculation explained! - YouTube
How Long Would it Take to Walk a Light-Year?
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Astronomers Find a Black Hole in Our Cosmic Back Yard - The New York Times
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What is a light-year? – Exoplanet Exploration: Planets Beyond our Solar System
