Starship Asterisk*

Guest wrote:
There is a mistake in the explanation. There is no light emitted by ionized hydrogen, either it should be neutral hydrogen or other species.

https://en.wikipedia.org/wiki/Solar_prominence wrote:
<<While the corona consists of extremely hot ionized gases, known as plasma, which do not emit much visible light, prominences contain much cooler plasma [including a lot of neutral hydrogen], similar in composition to that of the chromosphere.>>

Guest wrote:There is a mistake in the explanation. There is no light emitted by ionized hydrogen, either it should be neutral hydrogen or other species.

Guest wrote:There is a mistake in the explanation. There is no light emitted by ionized hydrogen, either it should be neutral hydrogen or other species.

The Hydrogen 21-cm Emission Line*

Gas
About 99% of the interstellar medium
(ISM) is gas: About 90% atomic or
molecular hydrogen, 10% helium, and traces
of other elements. Dust scatters and
absorbs visible light much more than a ga
s. The interstellar gas can be seen when
you look at the spectral lines of a binary
star system. Among the broad lines that
shift as the two stars orbit each other,
there are narrow lines that do not move.
The narrow lines are from much colder ga
s in the interstellar medium between us
and the binary system.
The hydrogen gas is observed in a variet
y of states: ionized, neutral atomic and
molecular forms. The ionized hydrogen emit
s visible light as the electrons combine
with the protons to form neutral hydrog
en. Both neutral atomic and molecular
hydrogen emit in the radio region
of the electromagnetic spectrum