"invisible" stars?

[Manok101]

I was listening to a podcast, and it got me thinking, have they found stars that only emit light in something that we can't see in our eyes? I mean like infared, or x ray light or something?

[johnrt]

All stars give off light throughout the entire spectrum - so there are none which are "invisible" to us.

There are of course ones we cannon see as they are too dim or hidden behind gas/dust rendering them invisible from out location on earth.

[Macavity]

There's quite a lot that cannot be seen, even at ordinary, visible wavelengths. The number of stars is still somewhat uncertain and can change...

Discovery May Triple the Number of Stars In the Universe | Space.com

However, even a dramatic increases on the ~4% "normal" matter in e.g. stars, cannot account for the need for ~23% dark matter, ~73% dark energy etc.