With a radius of 3,959 miles, Earth is the fifth largest planet in our solar system, and it's the only one known for sure to have liquid water on its surface. Earth is also unique in terms of ...

But as far as we know, no other bodies in the solar ... the same way Earth's plates sink back into the mantle. Europa's plate-like behavior also doesn't cover the moon's entire surface.

Opinions expressed by Forbes Contributors are their own. Jamie Carter is an award-winning reporter who covers the night sky. Computer simulations suggest that there is an undiscovered Earth-like ...

The European Space Agency’s Solar ... Earth. This velocity map, also called a ‘tachogram', shows the line-of-sight speed and direction of ... [+] movement of material at the Sun's visible surface.