Read More: Space.com
Some former NASA astronauts have a message for flat-Earther B.o.B: The curve is real, and we've seen it. Last week, the Atlanta-based rapper kicked off a crowdfunding campaign to raise $1 million, ostensibly so he can build and launch one or more satellites to settle the "question" of Earth's shape once and for all. B.o.B doubts that Earth is round because the horizon looks pretty flat in photos taken from the planet's surface. That's a simple consequence of Earth's large size, of course, but B.o.B doesn't see it that way. "Help B.o.B find the curve!" the crowdfunding project's description reads, in part. This plea elicited a response from former NASA astronaut Terry Virts. "I can save BoB a lot of money — the Earth is round. I flew around it," Virts tweeted Wednesday (Sept. 27) via his @AstroTerry account. Apollo 11 moonwalker Buzz Aldrin (@TheRealBuzz) responded to Virts Wednesday, tweeting, "I did too. It's called an orbit: the curved path of a celestial object around a star, planet, or moon."