An interior cutaway of the early Earth highlighting its major geodynamic processes. Magnetic field lines are drawn in blue and red emanating from the liquid core that generated them, while plate ...

The outer planet is the super-Earth HD 20794 d, and the green region in space is this solar system's habitable zone. An illustration of a habitable zone in a solar system. Credit: NASA The ...

Computer simulations suggest that there is an undiscovered Earth-like planet lurking in the distant ... [+] Kuiper Belt, well past the orbit of Neptune (artistic illustration). There may be an ...