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

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

Scientists believe that two asteroids might be fragments of long-lost "planetary embryos" from the early solar system.

In the paper, the researchers describe how they modeled the orbits of the four outer planets and performed ... which plunged deep into the inner solar system as it traveled.

The formation of our solar system from a singular nebula raises an intriguing question: why did each planet develop with a ...

To better understand why the planets have variable compositions ... led to the formation of the gas and ice giants in the outer solar system. This first-order model of planetary growth in the ...

This provides another piece of the puzzle to understand how planets and ... New studies offer a clearer picture of how the outer solar system formed and evolved based on analyses of trans ...

In reality, they are an ordinary and predictable part of living in a solar system ... Right now, the outer planets are all on relatively the same side of the system. As a result, we can enjoy a ...

Many of these near-match scenarios had the object zooming through the inner solar system, which prompted the researchers to add the terrestrial planets — Mercury, Venus, Earth and Mars — into ...

The discovery of two new planets beyond our solar system by a team of astronomers ... The existence of these two exoplanets - an inner super-Earth and an outer icy giant planet - within the ...

Related: Giant 'kidney beans' spotted in Mars satellite images could point to signs of water and life Using computer models of the four outer planets ... through the inner solar system, the ...