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.

Inner-ring planetesimals produced the inner solar system’s planets (bottom), and planetesimals from the middle and outer rings produced the outer solar system planets and Kuiper Belt (not shown).

Exoplanets have captured the imagination of public and scientists alike and, as the search continues for more, researchers ...

Earliest inner solar system planetesimals shaped the inventory of moderately volatile elements in terrestrial planets.

These situations allows scientists to investigate the usually hidden interiors of terrestrial worlds. Two teams of astronomers, including the observed planet's discoverers, now intend to join up ...

But once the star ignites, the inner layers of dust heat up dramatically ... These rocky bits eventually coalesced to form the terrestrial planets. However, at a distance of around 4 astronomical ...

With the exception of Pluto, planets in our solar system are classified as either terrestrial (Earth-like) or Jovian (Jupiter-like) planets. Terrestrial planets include Mercury, Venus, Earth ...

Most terrestrial planets have atmospheres, but the conditions on their surfaces would not allow humans to survive there. Venus is the hottest planet in our solar system (despite being further from ...