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

The sun, no doubt, is the brightest object in our planetary system. Its immense light illuminates all other objects in the ...

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

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

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

A new study suggests that a close encounter with a massive interstellar object, possibly eight times the mass of Jupiter, may ...

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

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

A powerful new tool comes online this year that could help astronomers locate the mysterious planet hiding somewhere beyond ...

The celestial bodies in our solar system take many forms. Some are made of rock, others gas, and others even ice. The farther ...

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 ...

The larger moons of Pluto and Earth likely formed through a collisional process with Charon and our moon, respectively, ...