'In a 1908 book Percival Lowell proposed that its surface markings were irrigation canals'
Mars
THE PLANETS: In a 1908 book Percival Lowell proposed that its surface markings were irrigation canals
In a 1908 book Percival Lowell proposed that its surface markings were irrigation canals
In a 1908 book Percival Lowell proposed that its surface markings were irrigation canals
THE PLANETS
Mars
THE PLANETS