3. Why do scientists sometimes use the Light Year instead of an Astronomical Unit (AU)?

Biology

2 answers:

AnnZ [28]4 years ago

8 0

Answer:

Since space is so vast AUs are not always enough to describe the distance between two places. One AU is only about 93 million miles, while some celestial bodies are billions of trillions of miles away. Light years allow scientists to talk about distance without using absurdly large numbers.

Harrizon [31]4 years ago

7 0

Answer:

When leaving the solar system and looking at other star systems, the AU is too small for scientists needs. So they created a LARGER unit of measurement. Scientists measure a light-year as the distance light can travel in one year. The next closest star to Earth (after the Sun) is Alpha Centauri, which is 4.34 light-years away.

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