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

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun ...

Further simulations on flybys into the inner Solar System revealed one of our own planets might be flung out of the ballpark ...

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in ...

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

Study reveals an interstellar object's impact on planetary orbits, reshaping solar system dynamics. Discover how simulations ...

Conduct more detailed simulations to refine the characteristics of the interstellar object and its encounter with the solar system. Search for observational evidence of such past encounters in the ...

A new study suggests that a planet-sized object may have passed through the solar system billions of years ago.

Michigan State University and NASA researchers discover seven dark comets that reveal new solar system secrets.

New research suggests that a massive, unidentified object might have passed through our Solar System billions of years ago, ...