revrendjim: Yes. We would "see" that stuff because it would block the light from sources behind it.
ZAZ: Tommy MooDark planets and such go by the collective name "massive compact halo objects" or MACHOs for short. There are experiments to detect them, e.g. searches for microlensing events. We don't see enough.
Tricky Chicken: I have always been a bit leery of dark energy/matter theories. And since I have a somewhat less than rudimentary understanding of what they are talking about, my opinion on the matter is unimportant.
mcgreggers99: "The Milky Way spins so fast it would fly apart if the gravity of some invisible matter weren't holding it together. Clusters of galaxies, buzzing around one another like angry bees, would similarly fragment and disperse. And when you run the gravitational numbers, the mysterious matter that keeps all that cosmic disintegration from happening should outweigh the familiar stuff by about four-to-one."I'm just a lowly engineer, but It sounds like they just make up stuff like this to try to make sense of the order of the universe that we can't understand. Surely it has to be an invisible force or matter that we can't yet detect.....(*spoiler alert*)God's spinning the galaxy on a big stick.
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