In this Hubble photograph of a distant galaxy cluster, a spotty blue arc stands out against a background of red galaxies. (newsweek.com)
By comparing Hubble's observations with those from the Spitzer Space Telescope the CLASH team was able to rule out red stars, brown dwarfs, and red galaxies as alternative explanations and concluded that the three images were a match for how the object would appear through the gravitational lens. (newatlas.com)
Asa comments: «A relatively simple result, that large galaxy bulges mean red galaxies, has profound consequences. (sciencedaily.com)