NATS 1745 Study Guide - Joseph Von Fraunhofer, Planetary Nebula, Norman Lockyer

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All attempts to detect stellar parallax failed until the 1830s because people believed that the brightest stars in the sky were the nearest stars to the earth. He announced that the stars have their own unique motions across the sky, but because the stars are so distant, their motion appears so tiny that we can"t easily perceive it. The stars move in their own direction with different speed. Reason: if a star has no noticeably motion after a century of tracking it then this star is probably very far away. Distance of 270,000 au [4. 4 ly (light years) or 1. 3 pc (parsecs)] The definition of a light year is the distance that light travels in one year. A parsec is the distance of an object with a parallax of 1 arcsecond. A parsec is bigger than a light year. A parsec is roughly 206,000 au (31 billion km) and a light year is about 63,000 au (9. 5 billion km).

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