let me share the results of a survey question I have posed to college students in my classes. Let’s see how you fare, imagining yourself to be in the same age bracket of 18–22:
Approximately how far have humans traveled from the surface of the Earth in your lifetime? [e.g., since 1980 or so]
■a) 600 km (low Earth orbit, 0.1 times the Earth radius)
■b) 6,000 km (about the radius of the Earth)
■c) 36,000 km (geosynchronous orbit; about 6 Earth radii)
■d) 385,000 km (about the distance to the Moon; 60 Earth radii)
■e) beyond the Moon
I make the question visual, which you can do as well. Start with a standard Earth globe (12 inch or 30 cm diameter). The first answer is 0.6 inches (1.5 cm) from the surface, followed by 6 inches (15 cm), then a yard (meter), then 30 feet (9 m) for the Moon. Take a minute to picture this.
Out of a total of 109 students responding (one group in 2006, another in 2010), only 11% got the right answer: low Earth orbit. 52% thought humans had been as far as the Moon since the 1980′s, and 20% thought we had been farther than the Moon. Some were indignant on learning the truth: “What do we use the space shuttle for, if not to go to the Moon?!” I can only guess that some students imagined the International Space Station as a remote outpost, certainly beyond the Moon, and likely strategically located next to a wormhole. How disappointing it must be to learn that it merely hugs the globe.