Expert Answers
ladyvols1 eNotes educator| Certified Educator

Simply put, a galactic year it is the Sun's period of rotation around the center of the Galaxy, equal to about 225 million years.  The Wikipedia blog states: “The galactic year is the duration of time required for the solar system to orbit once around the center of the Milky Way galaxy.It invites comparisons to the year (the duration of time it takes the Earth to orbit once about the Sun) and the month (traditionally the duration of time it take the moon to complete one orbit around the Earth). It also provides a conveniently “graspable” unit for thinking about cosmic and geological time periods”

astrosonu | Student

Galactic year means the Sun's period to move around the centre of the universe.



For more info message astrosonu. I will give you a set of info.

user3215774 | Student

      Our beautiful spiraling milky way rotates around its center, a black hole, once ever 200/250 million years.  We are in the galactic year 20 right now.  The dinosaurs also existed in the galactic year 20.  So don't hold your breath.  It will be a while before we can celebrate new years.    

astrosonuthird | Student

Galactic year is the time period, the sun takes to go around the centre of the Milky Way galaxy.



But I wonder why the great black hole of milky way do not swallow or solar system, when it comes the closest??


Can someone please answer me?