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Originally Posted by Pi Man
Ok, I get it. I read part of the article I posted a link to above and figured it out. They are comparing the brightness of distant (and therefore far in the past) novas (type 1a) to the brightness of closer (and therefore more recent) novas. That's how they got their answer. And they did compensate for the effects like distant galaxies receeding faster than closer ones.
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Ooh, that's changed my thinking a bit too... Thanks for pointing that out Pi Man...
Nothing to add, but it kind of means my earlier post misses the mark - the relevant one anyway.