It takes 3x10 years for a particular star to make
It takes 3x10⁷ years for a particular star to make one orbit around its galaxy. Assume that this star’s orbit in its galaxy is circular with a diameter of 10⁴ light years. A light year is the distance that light travels in one year. There are about 5.859x10¹² miles in 1 light-year. Estimate how many miles this star travels in one year.
The star travels about _____ miles in one year.
Number of years required
Distance travelled

3 x 107 years
Star’s orbit = circumference = 
= π x 104 light years
= π x 104 x 5.859 x 1012 miles
= 5.859 π x 1016 miles

1 year

Membership TRY NOW
  • Access to 800,000+ Textbook Solutions
  • Ask any question from 24/7 available
  • Live Video Consultation with Tutors
  • 50,000+ Answers by Tutors
Relevant Tutors available to help