Question

Define light year ,parsec and astronomical unit

Answer 1

LY-- Light year is the distance traveled by light in vaccum in one year.
1ly=9.46×10 to the power 15 mtr

Parsec=parsec is the distance from where the semi major axis of the earth subtends an angle of 1 second.
1 parsec=3.08×10 to the power 16


Astronomical unit=1 astronomical unit is equal to the mean distance between earth and sun.
1 astronomical unit=1.496×10 to the power 11

Answer 2

light year is the distance travelled by a beam of light in one year. It is used to measure distance people often confuse it as a unit to measure time