In a vacuum, light travels at approximately 2.9979×108 m s-1.
a. a How far will light travel in:
i 1 minute
ii 1 day?
b. b Assuming a year ≈365.25 days, calculate one light-year, the distance light will travel in a vacuum in a year.
c. c Apart from our own sun, the closest star to Earth is Proxima Centauri, which is an average distance of 4.22 light-years from Earth. Write this length in metres.