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It must have been a somewhat dull first generation of stars and planets with only Hydrogen and Helium around. On the other hand, giant stars explode after just
by Tepix 6y ago
It must have been a somewhat dull first generation of stars and planets with only Hydrogen and Helium around.
On the other hand, giant stars explode after just a few million years so it didn't take long for other elements to appear.
- dredmorbius 6y agoThe ratio of heavier elements to H & He is called metallicity, and it is a measurable characteristic of stars, which are classed into Type I (high metallicity) and Type II (low) populations. Low-metallicity Type II stars are generally older. Nothing specific on what Type II stellar systems and planets would be like, though I'd suspect gas giants, generally. https://en.wikipedia.org/wiki/Metallicity https://en.wikipedia.org/wiki/Metallicity
- saagarjha 6y agoI think they make up for their dullness by being absolutely massive–hundreds of solar masses, if not more.