A Planet Opposite Earth?

As Charles Adler discusses in his excellent book,Aliens,¬†Wizards and Starships,¬† a planet residing in Earths orbit, but directly opposite from Earh on the other side of the Sun would not be possible.It turns out that such an orbit doesn’t remain stable for very long, due to the destabilizing tugs from other planets. Historically, science fiction […]

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