The 3D map indicates where the cloud most muddies the ... or the absorption and scattering of background light by intermediate objects—in this case, dust grains. Of the 220 million spectra ...

Or does the star merely look reddish, since its light has had to travel through a cloud of cosmic dust to reach our telescope? For accurate observations, astronomers need to know the amount of ...

Or does the star merely look reddish, since its light has had to travel through a cloud of cosmic dust to reach our telescope? For accurate observations, astronomers need to know the amount of dust ...