HST PHAT Detail of M31
M31, NGC 224, Andromeda Galaxy detail
About 2.5 million light-years (0.8 megaparsecs)
WFC3/UVIS: F275W (UV) and F336W (U)
ACS/WFC: F475W (g) and F814W (I)
This image is a composite of separate exposures acquired by the WFC3 and ACS instruments on HST. Several filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are:
Detail M31 Image (at bottom)
Light purple: F275W (UV)
Blue: F336W (U)
Green: F475W (g)
Dark red: F814W (I)
NASA, ESA, and B. Williams and J. Dalcanton (University of Washington, Seattle)