how come in astrophysics, every measurement of time is unimaginably long or a tiny tiny fraction of a second

you never hear "over the course of several weeks,"

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@monorail I believe supernovae last a few weeks. SN1054 was visible for some months, if we remember right.

@monorail Star activity cycles happen on fairly short time scales, as well; the sun's is something like thirteen or twenty-six years, I think?

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