Oumuamua and Comet Borisov in 2017 and 2019, respectively, created a surge of interest. What were they? Where did they come ...

"Our Sun (Sol) is marked by a black hexagon, and its orbital path is indicated by a grey solid line (top row only). Alpha Centauri's location and path are shown by a yellow star and a solid blue line ...

The second interstellar object, 2I/Borisov, stood out because it entered the inner solar system from well above the orbital plane. But while we have only discovered two alien visitors so far ...

Detected in 2019, the Borisov comet was the first interstellar comet known to have passed through our solar system. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news ...

Gennady Borisov, an amateur astronomer in Crimea ... If it's larger, that suggests it's an interstellar object. The researchers behind the Gemini observations say their data shows an eccentricity ...

A newly observed interstellar comet is the most pristine visitor from outer space ever seen in our Solar System, according to a pair of studies released Tuesday detailing its unique characteristics.

A new study suggests that a close encounter with a massive interstellar object, possibly eight times the mass of Jupiter, may have significantly altered the orbits of the four outer planets in our ...

Turns out, it came from another star system. This is the first time humanity has observed an interstellar object. Astronomers discovered it on Oct. 19. At first, they thought it was a comet.