Darkmeans really, absolutely dark in the electromagnetic spectrum: not that it doesn't shine, or can't reflect light, but that it doesn't appear to be
ordinarybaryonic matter at all, at least as we currently understand it. Gas clouds, for example, glow in the infrared, even cool ones; asteroids can be seen via occlusion and gravitational interaction; X-ray astronomy is revealing even more cosmic phenomena that don't appear under visible light.
scaffolding(original paywall Nature paper summary, popular press coverage). The last I heard the actual
stuffof dark matter was still being debated, broken broadly into two camps with wonderful acronymns: WIMPs and MACHOs.
fudge factorto explain observed data is uncomfortably, unsettlingly, and measurably real. While the goal of science might be to put things in tidy little conceptual boxes, real progress is made on the edge cases, the "Huh, that's odd" phenomena... which includes the weird dust bunnies of the cosmos.
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posted by hermitosis at 7:39 PM on September 7 [1 favorite]