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Earth is rounded into an ellipsoid with a circumference of about 40,000 km. It is the densest planet in the Solar System. Of the four rocky planets, it is the largest and most massive. Earth is about eight light-minutes away from the Sun and orbits it, taking a year (about 365.25 days) to complete one revolution.
Planet Earth is a 2006 nature documentary television miniseries produced as a co-production between the BBC Natural History Unit, BBC Worldwide, Discovery Channel and NHK, in association with CBC. Five years in the making, Planet Earth was the most expensive nature documentary series ever commissioned by the BBC and also the first to be filmed ...
Theia (/ ˈ θ iː ə /) is a hypothesized ancient planet in the early Solar System which, according to the giant-impact hypothesis, collided with the early Earth around 4.5 billion years ago, with some of the resulting ejected debris coalescing to form the Moon.
Earth formed in this manner about 4.54 billion years ago (with an uncertainty of 1%) [25] [26] [4] and was largely completed within 10–20 million years. [27] In June 2023, scientists reported evidence that the planet Earth may have formed in just three million years, much faster than the 10−100 million years thought earlier.
Planet Earth III is a 2023 British nature documentary series produced by the BBC Studios Natural History Unit in co-production with The Open University, BBC America, ZDF, France Televisions and NHK. It is the third instalment in the Planet Earth series , with Sir David Attenborough reprising his role as narrator like its predecessors.
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. [3] The series was presented and narrated by Sir David Attenborough with the score composed by Hans Zimmer .
The following outline is provided as an overview of and topical guide to the planet Earth: . Earth – third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to harbor life.
As a planet approaches periastron, its speed increases as it trades gravitational potential energy for kinetic energy, just as a falling object on Earth accelerates as it falls. As the planet nears apastron, its speed decreases, just as an object thrown upwards on Earth slows down as it reaches the apex of its trajectory. [63]