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(a) The observed parallax of Sirius, the brightest star in the sky, is 0.375 arcseconds. How far away is it in parsecs? In light years? (b) The Hipparcos spacecraft could measure parallaxes as small as 0.001 a How distant is the furthest star for which we can measure parallax? How does this distance compare to the size of the galaxy!

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Solution a) Ka istance dfa starn faxsecs f= in arc seconds -0.315 2.661 Pa- sec s = 2.661米3-261 人ighf sta Y 1 S, is distance 1.56

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