# Why is detecting brown dwarfs difficult?

Why is detecting brown dwarf stars tedious and not always successful? They emit light in the infrared region, and given that we're surrounded by state-of-the-art technology in space today, why haven't the success rate grown? Why aren't all of the infrared-capable telescopes able to see them?

• All IR telescopes can see them? Are you asking why none were found prior to 1995? Thousands have been found since. Jun 18 '20 at 21:18

Brown dwarfs have historically been difficult to detect (directly) simply because of how faint they are. Typical luminosities may range from $$10^{-3}L_{\odot}$$ to $$10^{-5}L_{\odot}$$ depending on spectral type. Any object that dim will be tough to find, regardless of spectral type or what sort of telescope you're using - you can have the largest, highest-resolution telescope in the world, but it can't make the source intrinsically brighter.