Pronunciation: /laɪt jɪr/
noun a unit of astronomical distance equivalent to the distance that light travels in one year, which is approximately 5.88 trillion miles
A1 A light year is a unit of distance used in astronomy.
A2 The closest star to Earth is about 4.24 light years away.
B1 Scientists use light years to measure the vast distances between stars.
B2 The Andromeda Galaxy is approximately 2.537 million light years away from Earth.
C1 Interstellar travel would require spacecraft to travel at speeds faster than the speed of light to cover light years of distance.
C2 The concept of a light year helps us understand the immense scale of the universe and the distances between celestial objects.
formal A light year is a unit of astronomical distance equivalent to the distance that light travels in one year.
informal Did you know that a light year is the distance light travels in one year?
slang That spaceship can go like a million light years per hour, dude!
figurative Her progress in the project was like moving at the speed of light year compared to her colleagues.
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