When it comes to the Solar System, all we have left are the survivors. At last, that might be enough to know what happened 4.5 billion years ago.

Here's a look at our solar system, from the scorching surface of Venus to the home of the largest volcano.

Meanwhile, outer dark comets, which may have come from the outer regions of our solar system near Jupiter and beyond, have distinctly oval-shaped orbits and can span hundreds of meters or more.

The biggest flares are known as "X-class flares" based on a classification system that divides solar flares according to their strength. The smallest ones are A-class (near background levels ...