The Hubble Space Telescope recently took a picture of the currently nearest star to our sun, Proxima Centauri, which is at a distance of $4.243$ light years ($1$ light year = $9.5$ trillion km).
The orbits of several other stars near the sun are also known, and during the next 80,000 they will replace Proxima Centauri as the nearest star to our sun. For this problem we will study the two stars Ross $128$ and Gliese $445$.
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