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You asked for it!
How close was the Moon to Earth when the dinosaurs where alive - would tides have been monumental then and how would it have affected life on Earth?
Explain why if Jupiter and/or Saturn weren't in our solar system complex life evolving on Earth might not have been possible.
Relativity may not hold between galaxies - is dark energy or MOND more likely to be right?
From the SLOAN sky survey we structures in space that have a fractal pattern but are a size 10 times past the limits that relativity could apply (10 million light years) - discuss is it likely all spacetime is fractal? (a.k.a. scale-relativity)
Explain why if our solar system was further in or further out on our galactic arm - complex life would have been at greatly increased risk to survive?
Explain why if Earth was about 15% lighter complex life would have been unlikely to survive.
Explain how wierd spacetime expanding - rather than distant galaxies just receding really is!
For advanced life to exist about 32 independent variables have to fall within acceptable ranges (e.g. planet mass, planet position, presence of water, silicate balance, plate tectonics) explain just how incredibly unlikely are the chances of finding an environment where advanced life can prosper.
Under relativity the speed of light as an absolute limit to the rate of information exchange appears incredibly well proven, but introduce the environments where or when relativity may not hold sway and explain why it is so hard for us to study these regions (the big bang before inflation, within a black hole's event horizon, the empty space between galaxies (maybe), the world at quantum (Planck) scales of reality, ultra high energy density domains etc.
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