Biology, 26.12.2019 01:31 dartsummersillp3ff0a

Scientists use the light year to describe the relationship between object in space. what does light year measure?
a) the distance that light can travel in one year
b) the time it takes light to travel 1 million km
c)the brightness of light that travel through space
d) the number of years it takes light to travel to earth

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