You don't even have to go as far as dark matter, dark energy, or indeed space at all to find amazing undiscovered principles in physics. For example: put a ball

You don't even have to go as far as dark matter, dark energy, or indeed space at all to find amazing undiscovered principles in physics. For example: put a ball on your desk. Now push it. Did it resist? Why? Well, sure, there's a component of friction, but even without friction it would resist your push...so, why? Inertia, right? But where does inertia come from?!? http://en.wikipedia.org/wiki/Inertia#Source_of_Inertia http://en.wikipedia.org/wiki/Inertia#Source_of_Inertia