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The modern explanation for the origin of the Moon is usually the giant-impact hypothesis, which argues a Mars-sized body struck the Earth, making a debris ring that eventually collected into a single natural satellite, the Moon. [28] [29] The giant-impact hypothesis is currently the favored scientific hypothesis for the formation of the Moon. [30]
Lidov first presented his work on artificial satellite orbits at the Conference on General and Applied Problems of Theoretical Astronomy held in Moscow on 20–25 November 1961. [27] His paper was first published in a Russian-language journal in 1961. [3] The Japanese astronomer Yoshihide Kozai was among the 1961 conference participants. [27]
This is an accepted version of this page This is the latest accepted revision, reviewed on 2 December 2024. Alleged Earth satellite of extraterrestrial origin For the British rocket program, see Black Knight (rocket). 1998 NASA photo of space debris, an object believed by some conspiracy theorists to be an extraterrestrial satellite, the Black Knight GIF of the six images taken of the space ...
The classical theory of frozen orbits is essentially based on the analytical perturbation analysis for artificial satellites of Dirk Brouwer made under contract with NASA and published in 1959. [8] This analysis can be carried out as follows:
A communications satellite is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder; it creates a communication channel between a source transmitter and a receiver at different locations on Earth. Communications satellites are used for television, telephone, radio, internet, and military ...
Satellite is an object that orbits another object (known as its primary). The term is often used to describe an artificial satellite (as opposed to natural satellites, or moons). The common noun ‘moon’ (not capitalized) is used to mean any natural satellite of the other planets.
An animation showing a low eccentricity orbit (near-circle, in red), and a high eccentricity orbit (ellipse, in purple). In celestial mechanics, an orbit (also known as orbital revolution) is the curved trajectory of an object [1] such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such ...
On 8 April 2016, an object, given the temporary designation S509356, was discovered with an orbital period of 3.58 days. Although it has the typical area-to-mass ratio (m 2 /kg) of artificial satellites, it has a color typical of S-type asteroids. It was later identified as the Yuanzheng-1 stage from the launch of Chinese navigation satellites ...