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 ...

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

Our Solar System is a carefully balanced celestial dance held together by a virtually perfect balance of gravity and inertia.

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

All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

Tonight and throughout January, stargazers can see a planetary alignment in the night sky or what some are calling a ...

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

Scientists suggest an interstellar visitor may have altered planetary orbits in our Solar System, reshaping trajectories of ...

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

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

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

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