Calculate the number of years that New York and the Northwest coast of Africa took to reach their current locations, 6,760km apart, of the sea floor is spreading at an average of 4 in. per year.

The brightest star in the night sky in the northern hemisphere is sirius. its distance from earth is estimated to be 8.7 light years. a light year is the distance light travels in one year. light travels at a speed of 3.00 × 108 m/s. calculate the distance from earth to sirius in miles. (1 mi = 5280 ft) g