BR 2/12

What is a Light Year?

• The distance light travels in one year

• The distance from the Earth to the Sun

• The distance light travels in one month

• The distance from the Earth to the Moon

Approximately how many kilometers is one Light Year?

• 9.46 × 10^12 kilometers

• 1.496 × 10^8 kilometers

• 3.00 × 10^5 kilometers

• 5.88 × 10^10 kilometers

What is an Astronomical Unit (AU)?

• The average distance from the Earth to the Sun

• The distance light travels in one year

• The distance from the Earth to the Moon

• The distance between stars and galaxies

Approximately how many kilometers is one Astronomical Unit?

• 1.496 × 10^8 kilometers

• 9.46 × 10^12 kilometers

• 3.00 × 10^5 kilometers

• 5.88 × 10^10 kilometers

Why are Light Years and Astronomical Units used by astronomers?

• To measure distances within our solar system

• To measure time intervals

• To measure the weight of celestial bodies

• To measure the brightness of stars