One astronomical unit is the average distance between:
✓ Correct answer: a) Earth and the Sun
ExplanationOne astronomical unit (AU) is a unit of measurement used in astronomy to describe distances within our solar system.It represents the average distance between Earth and the Sun, which is approximately 149.6 million kilometers (or about 93 million miles).Light-Year (ly): A light-year is the distance that light travels in one year in a vacuum.It is commonly used to measure vast distances between stars and galaxies.Parsec (pc): A parsec is another unit of distance used in astronomy, equal to about 3.26 light-years or 3.086 × 10^13 kilometers.It is used primarily for measuring distances to stars and galaxies.Sidereal Day: A sidereal day is the time it takes for Earth to complete one full rotation relative to the stars, which is about 23 hours, 56 minutes, and 4 seconds.This is different from a solar day, which is based on the position of the Sun and is 24 hours.UPSC GS Paper-I PYQs 598 291
Practice more Science PYQs
Attempt a free 10-question quiz or browse the full Science & Technology previous-year-question bank with instant answers and explanations.
🔬 Science PYQs →