4 ms·
That's how I understand it. But maybe there are other standardizable objects. The sense I got from TFA is that there aren't.
by mirimir 7y ago
That's how I understand it.
But maybe there are other standardizable objects. The sense I got from TFA is that there aren't.
- kiliantics 7y agoThere are actually. There is a class of star in the "tip of the red giant branch" (TRGB) which have also been used to calibrate luminosities of type Ia supernovae[0] to form a "cosmic distance ladder". I believe they have been used to confirm the accelerated expansion results (though less strongly). I am not super well versed in stellar evolution, but I believe that the TRGB should make this calibration method independent of progenitor age? Hopefully someone could chime in on this. I was formerly a cosmologist and would be very interested to know more about this result from any experts that might be reading this. [0] There is an explanation of this calibration here: https://aasnova.org/2019/07/26/tldr-the-trgb-gives-us-another-h0ttake/ https://aasnova.org/2019/07/26/tldr-the-trgb-gives-us-anothe...