Difference between revisions of "Talk:3066: Cosmic Distance Calibration"
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I think that the crosshairs in question are markers to indicate which star is being labeled, not anything to do with video games. [[Special:Contributions/162.158.137.59|162.158.137.59]] 23:46, 21 March 2025 (UTC) | I think that the crosshairs in question are markers to indicate which star is being labeled, not anything to do with video games. [[Special:Contributions/162.158.137.59|162.158.137.59]] 23:46, 21 March 2025 (UTC) | ||
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| + | The crosshairs are all the same size because new red giant stars are all the same brightness. They are "TRGB" or "Tip of the Red Giant Branch" standard candles. Every star in that phase of evolution is exactly the same absolute brightness, so we can tell how far away it is by measuring the observed luminosity. [[Special:Contributions/162.158.212.132|162.158.212.132]] 00:35, 22 March 2025 (UTC) | ||
Revision as of 00:35, 22 March 2025
yay. DollarStoreBa'al (talk) 16:31, 21 March 2025 (UTC)
What makes such labels as real objects absurd is not the required size, but the required orientation to be readable from a single point in the universe - earth. 172.71.154.9 19:26, 21 March 2025 (UTC)
A straightforward application of the Anthropic principle. 104.23.187.189 19:35, 21 March 2025 (UTC)
I'm not sure I get the title text... 162.158.62.162 20:04, 21 March 2025 (UTC)
I like this part of the linked article: But cosmologists get only one universe to observe. -- Hkmaly (talk) 20:09, 21 March 2025 (UTC)
I think that the crosshairs in question are markers to indicate which star is being labeled, not anything to do with video games. 162.158.137.59 23:46, 21 March 2025 (UTC)
The crosshairs are all the same size because new red giant stars are all the same brightness. They are "TRGB" or "Tip of the Red Giant Branch" standard candles. Every star in that phase of evolution is exactly the same absolute brightness, so we can tell how far away it is by measuring the observed luminosity. 162.158.212.132 00:35, 22 March 2025 (UTC)
