Saturn’s rings range from about 10 metres to 1km in thickness.
Binary systems are pairs of objects in space that orbit a common centre point due to their gravitational attraction to each other. This seems to be a common question… I wonder why people are so interested in binary systems.
The other two guys answered this one really well, so I’ll just add that to it maybe. What is really cool about binary stars systems is that one star can rip the material off the other star. If this process goes on for long enough then the star that’s doing the ripping will become unstable due to the extra mass its gaining and it will explode in a huge supernova event. These are a special type of supernova called a type 1a supernova and they always appear the same brightness which is great for using them distance markers, or ‘Standard Candles’.