Question

In outer space, distances between object such as galaxies can be so vast that a new unit is used to measure them. This unit uses the distance cover by the fastest moving thing in the universe in a year. This is called a(n) A) lightyear. B) atomic year. C) galactic unit. D) astronomical unit.

Answer 1

A) lightyear.

Step-by-step explanation:

A lightyear is approximately 9,500,000,000,000 km, compared to how an AU is 149,600,000 km.

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Answer 2

Option D is correct.

Step-by-step explanation:

The distance between the galaxies is measured in astronomical unit. Our solar system is very large so for the measurement the distance between two objects we use the greatest unit of measurement which is astronomical unit.

In short it is represented as AU.

1 AU = 1.49×
`10^(11) m` = 149 million kilometers

The distance between the sun & earth is around 149 million kilometers. in other words we can say The distance between the sun & earth is 1 AU.

Therefore option D is correct.