The object has been designated as A/2017 U1 is about 400 metres in diametre and is moving at a pace moving much higher than normal.
A small asteroid or comet is believed to be the first confirmed "interstellar object" to have entered our solar system from somewhere else in the galaxy.
The rules for naming the interstellar objects need to be formulated by the International Astronomical Union as A/2017 U1 is the first one observed by astronomers. Astronomers are soon working to direct the telescope to the whole world and to be in outer space on the object. "What's most surprising is that we've never seen interstellar objects pass through before".
A/2017 U1, an object 400m wide, was first glimpsed on October 19 by University of Hawaii, NASA reports. "Weryk subsequently searched the Pan-STARRS image archive and found it also was in images taken the previous night, but was not initially identified by the moving object processing", Science Daily reported.
The detection was made using data from NASA's Kepler Space Telescope, a stellar observatory that was launched into space in 2009.
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"It's going very fast and like a trajectory we can say with confidence that this thing is on its way out of the solar system and does not come back", he explained.
According to scientists at NASA's Center for Near-Earth Object Studies (CNEOS), Davide Farnocchia, the object is the most extreme orbit he has ever seen.
The object zoomed into our solar system from above the path in which most planets and asteroids orbit the sun, called the ecliptic. The sun's gravity caused the object to make a steep turn, and it passed safely under the Earth's orbit on October 14 at about 15 million miles, which is roughly 60 times the distance between Earth and the moon.
By looking more closely at the route, the NASA team worked out more: that it had come from the direction of the constellation Lyra. A/2017 U1 has moved out of ecliptic plane and is now moving towards the Constellation Pegasus at a speed of 27 miles (44 Km) per second. For months, this interstellar interloper - a fragment of an alien solar system - has been hanging around our cosmic neighborhood.
"We have been waiting for this day for decades", said CNEOS Manager Paul Chodas. The Minor Planet Center is hosted by the Harvard-Smithsonian Center for Astrophysics and is a sub-node of the Planetary Data System Small Bodies Node at the University of Maryland (http://www.minorplanetcenter.net ).