text: There is strong evidence that proves that this 'Face of Mars' is not an alien structure, and instead simply a very common martian mesa that just happened to have shadows that made it appear to be a egyptian face. An alien structure on mars would be interesting, but I'm afraid this Face of Mars is not what it first appeared to be.In "The Challenge of Exploring Venus," the author describes why putting a man on the moon seems like a walk in the park compared to the horrendous obstacles preventing humans from pushing the frontier with visiting one of Earth's neighbors, Venus. The thick atmosphere is toxic to us. The clouds of sulfuric acid, the incredibly high temperatures on the planet's surface, and pressure would present challenges to mankind and its technology.