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If a planet was located approximately 28 thousand light-years from the center of a galaxy and orbits that center once every 284 million years, how fast is the planet traveling around the galaxy in km/hr? If needed, use 3.0 × 108 m/s for the speed of light.

 Jan 17, 2021
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Light years is a distance   28 x 10^3 light years is how far light woud travel in that time

 

28 x 103   x 3600 s/hr   x 24 hr/day x 365 day/yr  x  3 x10m/s  x 1 km/1 x 10^3 m    x 2  x pi   = distance  ( in  km in 284 x 106 years)

 

  now   divide that by  

         24 x 365 hrs / year  x 284 x106 yr    to get ........... km / hr

 Jan 18, 2021

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