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Chemistry

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    $\begingroup$ Because our eyes only see a limited range of energies. Using other instruments many other hydrogen lines are used in astronomy. $\endgroup$
    – Jon Custer
    Commented Jun 27 at 14:03
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    $\begingroup$ See en.wikipedia.org/wiki/Hydrogen_spectral_series - the Lyman series are all in the UV, the Paschen series are all in the IR. Only the Balmer series has lines in the human-visible wavelength region. $\endgroup$
    – Jon Custer
    Commented Jun 27 at 14:08
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    $\begingroup$ You can see the Balmer series lines in my answer here: physics.stackexchange.com/a/768678/313612. As per the wikipedia linked article, the other series beyond the range of typical human vision. They are readily detected by appropriate instrumentation. $\endgroup$
    – Ed V
    Commented Jun 27 at 15:28
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    $\begingroup$ It seems you have been taken by surprise that human eyes are able to detect photons from just a small part of the electromagnetic radiation spectrum. $\endgroup$
    – Poutnik
    Commented Jun 30 at 8:23
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    $\begingroup$ I, again, remove some stuff like "present in the universe, propagates in the hydrogen medium" This is chemistry, not astronomy. Hydrogen on Earth certainly shines just as well. $\endgroup$
    – Mithoron
    Commented 2 days ago