Exercise 1 solution

(a) 1,800 / 10,000 = 0.18, so 18%.
(b) 2000 - 1937 = 63 years; 63 / 18 = 3.5 years per major arrival on average.
(c) 70,900 x 30 = 2,127,000 km, about 2.1 million km. The source article says roughly 2.4 million km, which does not match; it would fit about 80,000 km a year (2,400,000 / 30). Report your own calculation and note the mismatch.