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 | Earth Earth, and a modern perspective of the world as an integrated environment that requires stewardship. Humans first left the planet in 1961, when Yuri Gagarin reached outer space. Designations - Adjective: Terrestrial, Terran, Telluric, Tellurian, Earthly Orbital characteristics - Aphelion152,097701 km 1.0167103335 AU Perihelion147,098074 km 0.9832898912 AU Semi-major axis149,597887.5 km 1.0000001124 AU Eccentricity0.016710219 Orbital period365.256366 days 1.0000175 yr Average orbital ... |
![Full steam ahead on Arizona\](images/articles/thumbs/verdecanyonthumb.jpg "Full steam ahead on Arizona\")
