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Why is it convenient to express the dist...

Why is it convenient to express the distance of stars in terms of light year (or) parsec rather than in km?

Text Solution

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A parsec is 206, 265 AU and is roughly the distance to the nearest stars. If we were to view a giant star with a diameter of 1 AU at a distance of one parsec, it would appear to be just `1//3600^("th")` of a degree in angular size. For comparison, the Sun and Moon are both half a degree in angular size when viewed from Earth.
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Knowledge Check

  • How many light years make 1 parsec?

    A
    3.26
    B
    6.67
    C
    1.5
    D
    9.4

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