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A hypothetical planet-sized Earth trojan the size of Mars, given the name Theia, is thought by proponents of the giant-impact hypothesis to be the origin of the Moon.The hypothesis states that the Moon formed after Earth and Theia collided, [10] showering material from the two planets into space.
The Spitzer Space Telescope is in an Earth-trailing heliocentric orbit drifting away c. 0.1 AU per year. In c. 2013–15 it has passed L 5 in its orbit. Hayabusa2 passed near L 5 during the spring of 2017, and imaged the surrounding area to search for Earth trojans on 18 April 2018. [15]
There are 28 known Neptunian trojans, [11] but the large Neptunian trojans are expected to outnumber the large Jovian trojans by an order of magnitude. [12] [13] 2010 TK 7 was confirmed to be the first known Earth trojan in 2011. It is located in the L 4 Lagrangian point, which lies ahead of the Earth.
Earth trojans, such as 2010 TK 7, are NEOs that orbit the Sun (not Earth) on the same orbital path as Earth, and appear to lead or follow Earth along the same orbital path. Other small natural objects in orbit around the Sun may enter orbit around Earth for a short amount of time, becoming temporary natural satellites.
Seeking advice from the Trojan Horse, Unico and Cheri learn that Kuruku is a puppet who was mistreated by his owners and discarded. He washed up at the Ends of the Earth – where all unwanted "junk" ends up eventually – and was brought to life with the power of 200 years of sunlight exposure, determined to take revenge on the human race.
Hektor is the first known trojan with a satellite companion and, so far, one of only four known binary trojan asteroids in the L 4 group (the others being 16974 Iphthime, 3548 Eurybates, and 15094 Polymele). 617 Patroclus, another large trojan asteroid of the L 5 group, consists of two almost equal-sized components. [13]
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This is an accepted version of this page This is the latest accepted revision, reviewed on 14 February 2025. 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 ...