Our understanding of the universe and physics is still young. We're reasonably sure about 'normal' matter, things like you, a beer, or a star. Unfortunately, th

Our understanding of the universe and physics is still young. We're reasonably sure about 'normal' matter, things like you, a beer, or a star. Unfortunately, that's only about 5% of the universe that we know of today. Things like Dark Matter, well, we know it falls down. That's about it, really. There's a lot of theories about it though. More unfortunately, we think Dark Matter is about 20% of the universe. Then there's Dark Energy. It makes things fall up (?!). And we're not super sure about that, either. Most unfortunately, Dark Energy is about 75% of the universe. We don't have a clue if any intelligence is even using photons to communicate anymore. Most of the universe doesn't seem to really interact with them anyways. And that's with this limited understanding of 'Dark' things. We're still standing at the shore of a vast ocean.