> It’s pure hydrogen

The gas around it is pure hydrogen. We can't know what's inside. Could be stacks of little green men and ponies in there.

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ndsipa_pomu 3 days ago | parent | next [-]

Arguably, it makes no difference at all as to what's inside (apart from the inference that the early universe had lots of singularity seeking ponies and little green men)

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catchclose 3 days ago | parent | prev [-]

Maybe, lazy or tired light, and everything shifts towards specific spectral lines or frequencies/wavelengths at distant observation. Attenuates? Asymptotes to the hydrogen line?

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jfengel 3 days ago | parent | next [-]

If light got tired it would make ordinary chemistry impossible. You wouldn't see spectra because atoms themselves would work differently (and probably not at all).

The fact that we can tell that it's hydrogen makes it extremely unlikely that light behaved differently there.

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adgjlsfhk1 3 days ago | parent | prev [-]

that doesn't work out. from the spectra we're seeing hydrogen spikes red shifted, so the lack of any other spikes is very strong evidence

	▲	catchclose 3 days ago \| parent [-]
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