Question

the galaxy we live in is roughly lens shaped,and pins.its diameter is given inlight years.
(1 light year=9.5Exp12km)

calculate the circuference or our galaxy in kilometres.
the earth is at a point 3Exp4 light yaersfrom the centre.How far does the earth travel in one turn of th galaxy
bobpursley
The first line makes no sense to me.

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