Question

How is the parsec defined? How big is a parsec compared with a light-year?

a) A parsec is the distance at which one astronomical unit subtends an angle of one degree. It is smaller than a light-year.
b) A parsec is the distance at which one astronomical unit subtends an angle of one arcsecond. It is larger than a light-year.
c) A parsec is the distance at which one astronomical unit subtends an angle of one arcsecond. It is smaller than a light-year.
d) A parsec is the distance at which one astronomical unit subtends an angle of one degree. It is larger than a light-year.

Answer 1

A parsec is the distance at which one AU subtends an angle of one arcsecond. It is smaller than a light-year. the distance at which one astronomical unit (AU) subtends an angle of one arcsecond. It is smaller than a light-year. One parsec is equal to approximately 3.26 light-years.

Step-by-step explanation:

A parsec is defined as the distance at which one astronomical unit (AU) subtends an angle of one arcsecond. It is smaller than a light-year. One parsec is equal to approximately 3.26 light-years. the distance at which one astronomical unit (AU) subtends an angle of one arcsecond. It is smaller than a light-year. One parsec is equal to approximately 3.26 light-years.

the distance at which one astronomical unit (AU) subtends an angle of one arcsecond. It is smaller than a light-year. One parsec is equal to approximately 3.26 light-years. parsec is defined as the distance at which one astronomical unit (AU) subtends an angle of one arcsecond. It is smaller than a light-year. One parsec is equal to approximately 3.26 light-years. the distance at which one astronomical unit (AU) subtends an angle of one arcsecond.