In this picture of IC 1795 you are gazing at glowing gas and obscuring dust clouds. This is in the constellation Cassiopeia and appears to be a dominantly red color. This very light-sensitve camera which took this photo has a narrow filter thaat only transmits H-alpha light which is the red light of hydrogen atoms. To make this H-alpha light, a hydrogen atom emits this H-alpha light while its electron is recaptured. Pretty close to this area is the Heart Nebula, which appears as a red dust and gaseous heart shape.
IC 1795 and the Heart Nebula are located 6,000 light years away and the whole APOD picture would span about a 70-light year distance.
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