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Interacting Galaxies Aglow with Millions of Young Stars
This image is a composite of separate exposures acquired by three separate space telescopes. Exposures in the optical range of the spectrum were acquired with ACS and WFPC2 instruments on the Hubble Space Telescope (HST). The near ultraviolet light was acquired by the Galaxy Evolution Explorer (GALEX), while near infrared emission was captured by the IRAC instrument on the Spitzer Space Telescope (SST). Several filters were used to sample these wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (greyscale) image associated with an individual filter. In this case, the assigned colors are:
Hubble ACS/F814W (I), WFPC2/F814W (I) red
  ACS/F606W (V), WFPC2/F555W (V), WFPC2/F675W(R) yellow-green
  ACS: F435W (B), WFPC2: F439W (B) blue
Spitzer IRAC: 8 micron orange
GALEX NUV Imaging Channel purple