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Parsec is the unit used for the measurement

Parsec is the unit used for the measurement Correct Answer Length

CONCEPT:

Parsec (parallactic second):

  • It is the largest practical unit of distance used in astronomy.
  • It is defined as the distance at which an arc of the length of 1 astronomical unit subtends an angle of 1 second of arc.

⇒ 1 parsec = 3.08 × 1016 m

EXPLANATION:

  • Parsec is the unit of distance used for the measurement of the distance between planets, stars, etc in the universe. Therefore, option 2 is correct.

⇒ 1 parsec = 3.07 × 1016m

Additional Information

Light year:

  • It is the distance travelled by light in a vacuum in one year.
  • A light-year is used in astronomy to measure the distances of nearby stars.

⇒ 1 light-year = 1ly = 9.467 × 1015 m

Astronomical unit:

  • It is defined as the mean distance of the earth from the sun. It is used in astronomy to measure the distance of planets.

⇒ 1 astronomical unit = 1 AU = 1.496 × 1011 m

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