American astronaut Ron Garan may be the single best promoter of space exploration we have today, if only because of his breathtaking photographs of the Earth from space. In July 2011, as he orbited our planet in the International Space Station, he took this gorgeous shot of the crescent Moon, setting over the Earth’s silhouetted limb:
[Click to enlunenate.]
This shows no fewer than three of my favorite optical effects! First, the colors of the sunset are due to the Earth’s air, which preferentially scatters away bluer light, leaving just the orange and red colors from the Sun to get through.
Second, the Moon is squashed! Read More