However, its lack of comet-like activity and later analysis of its orbit and light curve indicated that it was an asteroid that had been flying through interstellar space for hundreds of million of years before briefly passing through our system.
The Royal Astronomical Society in the United Kingdom announced on March 19, 2018 that the object called 1I/2017 ('Oumuamua) - the first confirmed asteroid known to have journeyed here from outside our solar system - may have come from from a binary star system, or two stars orbiting a common center of gravity.
Jackson and his colleagues, after determining binary star systems are very efficient ejectors of rocky bodies, concluded 'Oumuamua most likely originated in a binary system with a relatively massive component because such systems could be expected to have a larger number of asteroid-like bodies in close orbits. "'Oumuamua may have been ejected into space during planets" formation; the system was likely home to a high mass and hot star.
With a length of at least 1,300 feet (400 m), a diameter of 335 feet (100 m), and traveling at a blistering speed of 67,100 mph (30 km per second), at its closest it was about 20.5 million miles (33 million km) from Earth. But this object from another star system wasn't entirely unexpected.
The Sun is a single star system, but there are many systems made up of two or more stars orbiting one another about a common focus.
In contrast, icy comets, rather than asteroids, were more commonly ejected from lone star systems.
When it was first discovered researchers initially assumed the object was a comet, one of the countless icy objects that release gas when they warm up on approaching the Sun.
Its trajectory, speed, and orbit shape do not match any asteroids in our Solar System, and it is the first confirmed sighting of an interstellar asteroid.
As a starting point, Jackson says it's important to understand that in order for an object to be ejected from a star system it needs to interact with something big. Our solar system mostly ejects comets, which suggests the asteroid 'Oumuamua likely came from a planetary system different from our own.
After piquing the interest of an entire astronomical community, we might have an answer to the origin of the unlikely object in our solar system. He added that it was unusual because the solar system ejects more comets than asteroids.
A team of researchers has examined the data collected on Oumuamua trying to determine where this asteroid is coming from.
Per the researchers, similar to how comets help us understand the planet formation in our solar system, such objects originating from distant solar system helps us understand their formation system which is a great achievement.