Before we jump to premature conclusions with easy answers such as 'nothing at all' or 'at least they are both orbiting the Sun', perhaps we could do some quick research, just in case... With Jupiter's equatorial radius almost thirty times bigger than the same property on Mercury, the obvious composition difference between one gas giant and a small rocky planet and all the other major differences in mass, density, temperature, orbital inclination, and orbit period, and with almost everything we could compare the two, it is very hard to find the slightest similarity. Not to say that Jupiter in its arsenal is in possession of moons equal to or even bigger in size than the smallest planet of our solar system. However, within the past couple of seasons, what they had in common was the fact that they were under the spotlight of all of us who, from time to time, enjoy gazing at the sky with our naked eyes or through modest telescopes with a strong feeling of being th...