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 ...

In essence Levison’s team proposed that our solar system’s four giant planets—Jupiter, Saturn, Uranus, and Neptune—had started out much more closely packed together, on nearly circular ...

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

Analyzing images from a nearby observatory ... aligned—with orbits that are tilted compared to the solar system, and elongated, not circular like the orbits of other planets.