Question

define light year, Astronomical unit and passec.​

Answer 1

Answer:

Lightyear: It is defined as a distance travelled by light in a vacuum in one year. 1 light year = 9.46 x 1015 m. One astronomical unit: It is a mean distance between the sun and the earth. ... 1 parsec: It is the distance at which an arc of length one astronomical unit subtends an angle of 1 second of an arc.

Answer 2

Answer:

..****!!!!!!!! A light year is a distance light travel in a year.....

and an astronomical unit is the average distance between the Earth and Sun. So the distance To the Sun is by definition one Au ......*****!!!!!

Explanation:

.........******!!!! A parsec is a distance at which one astronomical unit Subtends an angel of one second of arc......****!!!

.. ..... I hope this information are helpful for you ......