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> Reflection nebula in NGC 6188 in Ara

Reflection nebula in NGC 6188 in Ara

author: Anglo-Australian Observatory/David Malin Images/Novapix

reference: a-neb61-88003

Image Size 300 DPI: 51 * 40 cm

The fainter stars here are cool, like those that orbit the inner 'bulge' of the Milky Way and appear slightly yellow on colour pictures. The foreground patch of dust that crosses this photograph must be illuminated by energetic radiation from stars that are much hotter than those in the background because hydrogen, which is associated with the dust, has been excited into a vivid red fluorescence by absorbing the invisible ultraviolet light. Here and there a few bright but cooler stars are caught up in the outskirts of dust clouds and some of their light is scattered to produce the blue reflection nebulae.

Keywords for this photo:

1987 - AAO - ARA - ASTRONOMY - NEBULA - NGC 6188 - POSTER - REFLECTION NEBULA - SIDING SPRING - SOUTHERN HEMISPHERE - STAR -