The Hardness of Science Fiction

Ah, the rabbit hole, the portal-to-another-dimension that is TV Tropes. If you've never fallen down this particular hole, opening your eyes to find you haven't shown up at work for three days and the goldfish is dead, than I both pity and envy you. 

Just a snippet for you sci-fi readers and writers. Someone has concocted a scale by which we can assess the relative hardness of science fiction