Well, thoughts are pretty beautiful, aren’t they? I mean, you’re born with this weird thing known as a “mind” and somehow you’ve figured out that you’re alive, and from that single acknowledgement of consciousness stems all these other things - words, geography, memories, feelings, facts, connections, sensations, being. And then, in terms of learning things about the universe, it’s really just a matter of looking beyond yourself and recognizing that the external world (science, art, people, anything) is out there, and that there is so much of it. That’s what distinguishes us from rocks or trees, right? We care about solar systems and chemical compositions and relationships and lives and things. Sorry, um, this probably sounds really pretentious, but I don’t think I have a proper way to explain it.
Short answer: knowledge is beautiful because it gives you a legitimate reason to exist.