7/10
Distance error to stars
11 January 2019
At 40 minutes into the movie, there is a discussion of life in the universe. The distance to the nearest star system is used as an example of the vast interstellar distance. Alpha Centauri is actually a triple star system, about 4.37 light years away. They say in the movie "4 light years away, 6 trillion miles." No - a light year is 6 trillion miles - the distance that light travels in a year. Four times six is 24 (rounded off). I more accurate distance is about 26 trillion miles away. There are 3 problems with the public in this area: 1) People confuse light years with time 2) The writers don't really know the subject 3) People like Walter Cronkite could not say "trillion". He would say "million million". Big numbers always bothered people - the term "vast multitude" was used, or terms like "quadrillion" were used.
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