Question

What is the distance between stars expressed in light years? What do you understand nby the statement that a star is eight years away from the earth

Answer 1

The distance between the earth and the stars and between stars are very large .Thus it is inconvenient to express it in terms of kilo meters.
Thus the large distances are expressed in light years .
One light year is the distance travelled by light in a year which is equal to 9.46 * 10¹² km.
a star is located eight light years from the earth means the distance between the earth and the star is the distance traveled by light in 8 years.
8 light years = 7.6 * 10¹³