CBSE Class 11-science Answered
hey
pls give me a better explanation for parsec
Asked by niza17kapoor | 20 Jun, 2019, 11:40: AM
Expert Answer
Parsec is unit for expressing distances to stars and galaxies, used by professional astronomers.
It represents the distance at which the radius of Earth’s orbit subtends an angle of one second of arc.
( 1 Astronomical unit = 1 A.U = radius of earths orbit)
Thus, a star at a distance of one parsec would have a parallax of one second,
and the distance of an object in parsecs is the reciprocal of its parallax in seconds of arc.
For example, the nearest star, Proxima Centauri, which is part of the Alpha Centauri triple-star system,
has a parallax of 0.769 second of arc, and, hence, its distance from the Sun and Earth is 1.30 parsec.
One parsec equals 3.26 light-years, which is equivalent to 3.09 × 1013 km (1.92 × 1013 miles).
Answered by Thiyagarajan K | 20 Jun, 2019, 12:21: PM
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