‘Oumuamua (ōmo͞oˈəmo͞oˈə), officially 1I/2017 U1 (‘Oumuamua), interstellar object, the first to be discovered in the solar system. Highly variable in brightness, it also is highly and unusually elongated—a cigar-shaped object perhaps as much as 1,300 ft (400 m) long—with a rapid, chaotically tumbling rotation. It appeared to be composed of of rock and metal, indicating that it is an asteroid, but other evidence suggests it might be cometlike, such as its reddish outer surface and the speed at which it was moving (which appears not to be explained by the pull of gravity alone, suggesting that ejected gas was also propelling it, but no evidence of such gases were recorded). Other researchers have suggested that it may be a piece of planet destroyed by a star's gravity, or a block of frozen hydrogen formed in the core of an interstellar cloud. ‘Oumuamua was first observed in Oct., 2017; traveling along a hyperbolic trajectory, it made its closest pass to the sun in Sept., 2017.
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References in periodicals archive ?
Apart from looking for technosignatures, the initiative also contributes to finding exoplanets, detecting fast radio bursts and studying interesting objects such as 'Oumuamua.
Scientists concluded that the cigar-shape object, named 'Oumuamua, was natural.
'Oumuamua, the mysterious alien object that passed through Earth, continues to baffle scientists as to what it really is although they all agree that is not from this solar system.
Greg Laughlin's article on 'Oumuamua (S&T: Oct.
Spectroscopy and thermal modelling of the first interstellar object 11/2017 U1 'Oumuamua. Nature Astronomy.
'Oumuamua', the rocky object identified as the first confirmed interstellar asteroid, very likely came from a binary star system, new research has found.
The results come as a project to search for life in the cosmos has been using a radio telescope to check for radio signals coming from the strange, elongated object, named 'Oumuamua.
The object, known as 'Oumuamua, was heated to more than 300degC as it passed by but it is thought a half-metre thick coating prevented it from being vaporised.
The object, known as 'Oumuamua', was heated to more than 300degC as it passed by but it is thought a halfmetre thick coating prevented it from being vaporised.
In October, scientists discovered a massive, cylindrical object visiting our solar system, which has been dubbed 'Oumuamua,' a Hawaiian term that means 'a messenger from afar arriving first.'
This research investigated the rate at which interstellar objects such as 'oumuamua could potentially spread life across star systems within a galaxy.