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Planet Earth is a 1974 American made-for-television science fiction film that was created by Gene Roddenberry, written by Roddenberry and Juanita Bartlett (from a story by Roddenberry). It first aired on April 23, 1974 on the ABC network, and stars John Saxon as Dylan Hunt. It was presented as a pilot for what was hoped to be a new weekly ...
Planet Earth II is a natural history documentary series, produced by the BBC as a sequel to the highly successful Planet Earth television series, which aired roughly a decade earlier, in 2006. [8] The series was presented and narrated by Sir David Attenborough with the score composed by Hans Zimmer .
Currently most of the objects of mass between 10 9 kg to 10 12 kg (less than 1000 teragrams (Tg)) listed here are near-Earth asteroids (NEAs). The Aten asteroid 1994 WR12 has less mass than the Great Pyramid of Giza, 5.9 × 10 9 kg. For more about very small objects in the Solar System, see meteoroid, micrometeoroid, cosmic dust, and ...
Planet Earth III. Planet Earth is a 2006 British television series produced by the BBC Natural History Unit. Five years in the making, it was the most expensive nature documentary series ever commissioned by the BBC and also the first to be filmed in high definition. [1] The series received multiple awards, including four Emmy Awards, a Peabody ...
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The history of Earth is divided into four great eons, starting 4,540 mya with the formation of the planet. Each eon saw the most significant changes in Earth's composition, climate and life. Each eon is subsequently divided into eras, which in turn are divided into periods, which are further divided into epochs . Eon.
Based upon the size of the Earth and the force of gravity on its surface, the average density of the planet Earth is 5.515 g/cm 3, and typical densities of surface rocks are only half that (about 2.75 g/cm 3). If any significant portion of the Earth were hollow, the average density would be much lower than that of surface rocks.
The planet is about the size of Venus, so slightly smaller than Earth, and may be temperate enough to support life, the researchers said. Dubbed Gliese 12 b, the planet takes 12.8 days to orbit a ...