Posted: August 17th, 2016

If the distance to the nearest star is 4.2 light-years, then a. the star is 4.2 million AU away. b. the light we see left the star 4.2 years ago. c. the star must have formed 4.2 billion years ago. d. the star must be very young. e. the star must be very old.

If the distance to the nearest star is 4.2 light-years, then a. the star is 4.2 million AU away. b. the light we see left the star 4.2 years ago. c. the star must have formed 4.2 billion years ago. d. the star must be very young. e. the star must be very old.