But, parsec can be used for measuring larger distances and it is the largest unit used for measurement. A light year is defined as the distance covered by a beam of light in one year. But the Solar System is tiny compared to the size of the universe and much bigger units are needed when we go beyond it. The Astronomical unit is useful for measuring distances within the Solar System. Therefore, the correct option is option B. Using these two measurements, along trigonometry, the length of the adjacent side (the parsec) can be determined. The two dimensions on which this triangle is based are the opposite side (defined as 1 AU-distance from the Earth to the Sun) and the angle (defined as 1 arc second). One parsec is equal to the length of an adjacent side of the imaginary right triangle in space. It is obtained by using trigonometry and parallax. Or, it is the unit of length which is used to measure the large distances of celestial bodies outside the solar system. It is defined as the distance at which one AU (astronomical unit) subtends an angle of one arc second, and is equal to 3.26 light years. Parsec or parallactic second or is a unit of distance. Sizes of galaxies usually measured in kpc. Parsec is also a unit for measurement which is used for measurements outside the solar system. A parsec (pc) is defined as the distance at which a ruler’ of length 1 au subtends an angle of 1 arcsecond. The distance that light travels in one Earth year is called a light year. For space objects light-year is used to describe their distance. Hint: We measure physical quantities with their standard units.
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