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 ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

A new study suggests that a planet-sized object may have passed through ... The findings could significantly shift our understanding of the solar system’s evolution. Advisory Alert: It has ...

NASA artist’s conception of a brown dwarf (main) and stock image of the planets in the solar system (inset). An object between 2 and 50 times the mass of Jupiter may have flown through our ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

An unidentified interstellar object, possibly eight times Jupiter’s mass, may have disrupted the solar system’s planets.

"The lightsail will travel faster than any previous spacecraft, with potential to eventually open interstellar distances to ...

The research, yet to be peer-reviewed, sheds light on what could have changed the orbits of several planets in the solar system.

Scheduled to launch on Feb. 27, NASA's PUNCH mission could revolutionize space weather forecasts, unify the solar corona and ...

A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the four outer planets, a new study suggests.