It's a cycle from the Mayan calendar. A b'ak'tun is 20 ...
The same side of the Moon always faces the earth. The ...
A star in the triple star system Gliese 667. Located in the ...
The theory that life spreads throughout the universe as DNA ...
Members of the public are being asked to join the hunt for ...
The Galilean moon closest to Jupiter and the fourth-largest ...
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26 用語
