3 ms·
Everything you say is correct up until the last sentence. Metal-poor stars tend to be old, because the metallicity of galaxies is increasing with time (as fusio
by DiogenesKynikos 3y ago
Everything you say is correct up until the last sentence. Metal-poor stars tend to be old, because the metallicity of galaxies is increasing with time (as fusion in stars and supernovae combines light elements into heavier elements).
- maxnoe 3y agoYoung relative to their own lifetime, old relative to us.
- evanb 3y agoI meant young as maxnoe suggests but you’re right obviously, a better less ambiguous thing to say is that they are from a time/place when/where no other stars have yet had the opportunity to die.
- ozfive 3y agoWait. That's an interesting statement. "Had" is the keyword which implies dual realities.
- magicalhippo 3y agoGuess a better way to phrase it is that metal-poor stars were formed long ago, relatively early after the big bang. If they're old or young depends on where in their lifecycle we observe them.