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In this magnified view we can the EROs and EBOs.

EROs – Extremely Red Objects – the reason for the extreme redness of these galaxies are that are seen at early stage of their formation where they are still enshrouded in a lot of dust – like star being born in nebula. This dust absorbs the light the stars and re-emits it a red wavelength.

EBOs – Extremely Blue Objects – are young galaxies undergoing massive star birth.