Is a star that emits heat, enough for life to exist on its planets, however does not emit much light possible?

NOTE: I'm not asking if life on a lightless planet is possible.

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  • $\begingroup$ I don't think you can have a fusion reaction that is so low energy that only infrared and radio waves are released with no visible light wavelengths. $\endgroup$ – DKNguyen Nov 21 at 1:26
  • $\begingroup$ Yeah, I didn't think so, either. $\endgroup$ – ioi Nov 21 at 1:28
  • $\begingroup$ Well, there is technically a black dwarf, but no fusion there. $\endgroup$ – DKNguyen Nov 21 at 1:29
  • $\begingroup$ Those don't preduce much heat, right? $\endgroup$ – ioi Nov 21 at 1:30
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    $\begingroup$ Cross-posted on Astronomy.SE $\endgroup$ – Glorfindel Nov 21 at 8:16

What you describe is called a brown dwarf. The line between a very small and dim dwarf star and a very large gas giant that is also a rogue planet is a bit fuzzy, but brown dwarfs actually have a weak fusion reaction inside.

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