Año luz (al)

A light-year is a unit of distance used in astronomy, equivalent to about 9.5 trillion kilometers. It simplifies expressing vast astronomical distances. The nearest star is around 4 light-years away, and the closest galaxy is approximately 25,000 light-years distant.

What is a light-year equivalent to in kilometers?

• Approximately 9.5 billion kilometers

• Approximately 9.5 million kilometers

• Approximately 9.5 trillion kilometers

• Approximately 9.5 quadrillion kilometers

Why is the light-year a useful unit for measuring astronomical distances?

• Because it is easier to calculate than kilometers

• Because it is a smaller unit than kilometers

• Because it simplifies the expression of very large distances

• Because it is the standard unit for all scientific measurements

Which of the following is NOT a reason for using light-years in astronomy?

• To express distances in a more comprehensible way

• To make calculations easier

• To provide a standard unit for all distances

• To avoid long numbers in kilometers

How far is the nearest star from the Sun in light-years?

• About 8 light-years

• About 6 light-years

• About 4 light-years

• About 2 light-years

What is the approximate distance to the nearest galaxy in light-years?

• About 25,000 light-years

• About 10,000 light-years

• About 15,000 light-years

• About 20,000 light-years