ItвЂ™s still the first interstellar object weвЂ™ve ever witnessed crossing into our solar neighborhood.ДЄnd scientists still donвЂ™t know if it represents an entirely new class of objects - neither comet nor asteroid - that are hurtling through the galaxy. HereвЂ™s the thing: Oumuamua doesnвЂ™t have to be an object created by an alien species to be cool. Yet which of Bialy and LoebвЂ™s findings do you think got most of the press attention? Screenshot/GoogleNews As this excellent Vox piece by Liv Boeree explains, if other intelligences exist, they are probably far beyond the cosmological horizon and therefore forever invisible to us. ItвЂ™s extremely unlikely that Oumuamua is actually an alien spacecraft, propelled by some sort of alien technology. ItвЂ™s a fun thought, but Bialy and Loeb present nothing beyond hypothetical evidence this could be the case. As The Verge points out, Loeb is the chair of the advisory board for this project.) So you may think, вЂњWell, an advanced alien species might be able to make these things as well.вЂќ Humans have designed these light sails (thereвЂ™s a pretty gonzo plan in the works called Breakthrough Starshot to develop solar sails propelled by lasers to send tiny spacecraft to the star Alpha Centauri. You can think of a light sail as being like a kite, but instead of being pushed by air in our atmosphere, radiation from the sun propels it forward. ItвЂ™s possible, they suggest, that Oumuamua is a light sail, a type of spacecraft propulsion device. They find that solar radiation pressure - i.e., the force the sunвЂ™s radiation exerts on objects - is a plausible explanation for the objectвЂ™s acceleration, if itвЂ™s the case that Oumuamua is a very thin object.ДЄt the very end of the paper, they throw out another hypothetical explanation: вЂњAlternatively, a more exotic scenario is that вЂOumuamua may be a fully operational probe sent intentionally to Earth vicinity by an alien civilization.вЂќД®xotic indeed. In a forthcoming paper in Astrophysical Journal Letters, Harvard professors Shmuel Bialy and Abraham Loeb revisit the observations of Oumuamua and find that its motion does indeed seem to be explained by normal phenomena (Loeb is the head of HarvardвЂ™s astronomy department).

NASA/JPL-Caltech Was it sent to us by intelligent alien life? (Spoiler: Unlikely!)

An artistвЂ™s illustration of how Oumuamua moves through space.

far-out-there explanation for OumuamuaвЂ™s speed. So thereвЂ™s evidence both for and against the hypothesis that Oumuamua is a comet or comet-like. Also confusing: When Oumuamua was closest to the sun, it didnвЂ™t break apart like a comet would amid the heat and display a telltale tail. However, astronomers saw no visible evidence of these jets. Like a comet, it may have been expelling debris and gases from its surface that would be enough to propel it along like rocket fuel burning off the end of a spacecraft. There could be a very simple explanation for OumuamuaвЂ™s acceleration. NASA JPL Oumuamua is a very mysterious, fascinating object When the Hubble Space Telescope spotted Oumuamua in the beginning of January 2018, it was some 25,000 miles ahead of its expected trajectory (see the GIF below), as a paper by Micheli and co-authors in Nature explains. вЂњThere was something affecting its motion other than the gravitational forces of the Sun and planets,вЂќ Marco Micheli of the European Space Agency, which was tracking the object, said in a June pr ess statement.

After slingshotting around the sun with enough speed to overcome the grasp of its gravity, it did something a bit unexpected: It sped up, propelled by some inexplicable force. In 2018, the mystery of Oumuamua deepened further. And they still donвЂ™t know whether it was truly an asteroid, or something more closely resembling a comet. Since the rock was the first interstellar object ever spotted in our solar system, the scientists called it Oumuamua - a Hawaiian word meaning either вЂњscoutвЂќ or вЂњmessenger sent from the distant past to reach out to us.вЂќ But they had no idea where it came from. For reference, Voyager 1, the spacecraft thatвЂ™s currently leaving our solar system, is traveling at around 35,000 mph. But unlike the millions of known asteroids in our solar system, this one was traveling so fast - more than 70,000 miles per hour - that it couldnвЂ™t be captured by our sunвЂ™s gravity, the scientists reasoned. The astronomers thought it might be an asteroid. In October 2017, astronomers operating the Pan-STARRS1 telescope in Maui found a bizarre cigar-shaped rock blazing its way through our solar system.

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