The Mandarin Expression of the Week is:
What can we say to Mandarin-speaking people about why the earth is unique?

Earthrise
This iconic picture shows Earth peeking out from beyond the lunar surface as the first crewed spacecraft circumnavigated the Moon.

Pale Blue Dot
This narrow-angle color image of the Earth, taken from a distance of more than 4 billion miles (6.4 billion km) from Earth, is a part of the first ever “portrait” of the solar system taken by the Voyager 1 space probe. (Earth is the blueish-white speck almost halfway up the rightmost band of light.)
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