The solar system has many more moons than the one we can see in the sky. But how many do we actually know about? And how many more are waiting to be discovered? Faint signatures detected by the ...

The way people think of the Solar System has changed many times throughout history. Before the development of the telescope, these ideas were based on what could be seen with the naked eye.

And in the past decade, more than 20 spacecraft have ventured into the deepest reaches of our solar system. These probes ... a larger version of this image. Science Magazine, AAS / Carnegie ...