The universe has just presented humanity with yet another blow to our collective ego. It’s not enough that the earth isn’t the center of the universe, or even that we’re just so VERY tiny and insignificant in the big picture. No, now it turns out that we (meaning the earth, the sun, and all the stars and galaxies out there) aren’t even made of the stuff that makes up over 90 percent of the universe. And just what the vast majority of the universe is made of is a major mystery.