Why are brown dwarfs so difficult to detect?

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    They tend to congregate only near very large stars and so are not noticed.
     Their color makes them blend in with the background light from emission nebulae.
     They all lie outside the plane of the galaxy, making them hard to see against the background of globular clusters.
     They are too small and dim to emit substantial amounts of radiation.
     They are found only in cold molecular clouds, which block their light from reaching us.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

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They are too small and dim to emit substantial amounts of radiation.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)

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