The Tetra Starship, also known as 2l/2020–TETRA, is the first known extraterrestrial vessel to reach the Solar System. It was discovered after it passed the Moon. Initially assumed to be a very bright comet, it was reclassified as an abnormal object less than an hour later after it made a course correction and entered into an elliptic orbit around Earth. It is currently orbiting Earth at a distance of 310,502.82 km (192,937.51 miles). The origin of this spacecraft is unknown.
On January 5th, 2020, 1:36 AM GMT, Earth's satellites start experiencing strong, simultaneous disruptions. After investigating, NORAD and other major international agencies determine that the radio disturbance is originating from outer space. Thousands of amateur astronomers across North America and Europe spot an enormous alien mothership that has entered Earth's orbit. News of the discovery quickly gains worldwide coverage, and all nations' militaries are put on high alert.
The Tetran Starship is capable of generating wormholes by utilizing unknown energy sources. It is still unclear why it came to Earth.
Nothing is known about the origins of this spacecraft. The ship was most definitely assembled in space, and required vast amounts of resources and infrastructure to build, as well as advanced expertise in aerospace engineering.
The Tetran Starship entered the Solar System via a wormhole that originated near Neptune. The strong infrared signature emitted by the source was present for less than two hours before completely vanishing, but the spaceship was never detected
Since the vessel was discovered 4 days after it entered the Solar System, its average speed must have been around 9,644.58 km/s, given that 62 hours later a much closer heat signature was detected by infrared telescopes at a distance of approximately 2,117,505,500 km (1,315,756,917.10 miles), suggesting that the ship began deceleration.
During the last phase of deceleration, the ship completed several elongated, elliptical orbits around Earth before making a course correction. It came to a halt shortly after bypassing the Moon. Due to its high velocity and relatively small size (comparable to asteroid 8 Flora), it remained undetected for most of its journey, and its heat signature was picked up only when the ship's engine pointed at Earth.
The Tetran is, by Earth’s standards, of staggering proportions: shaped like a truncated tetrahedron, each side measures 118.21 km (73.45 miles), making it the largest known artificial object. At its center lies a dense sphere with a diameter of 26.30 km (16.34 miles), which contains the ship’s engines and main reactors.
The ship's exterior is made out of dense metals. Infrared analysis reveals that the core of the sphere holds some type of unknown energy source, likely used as fuel to power the ship.
Similar to the molecular properties of methane where a carbon atom is located at the center and four hydrogen atoms at the corners, the Tetran Starship is held together by four cylindrical megastructures that originate from the surface of the sphere and connect perpendicularly to the four external triangular prisms that, when attached, form the shape of a symmetrical tetrahedron. Each of the cylinders are separated by an angle of exactly 60°, unlike most tetrahedral molecules which tend to be asymmetrical with bond angles of approximately 109.5°.