This one will look like a jellybean,” the session director warns us. “Or, you know, when you empty a hole punch? The circles of paper that fall out? One of those.” She’s talking about Neptune, and I am about to step, carefully, up a ladder painted industrial yellow and wheeled into place in front of the centenarian eyepiece of the 60″ Hale telescope at Mt. Wilson Observatory, incidentally the very place where Edwin Hubble, in 1925, discovered that our galaxy was not the entirety of the Universe, and later, that our Universe was expanding.