NGC 7635, Bubble Nebula (WFC3)

7,100 light-years (2,100 parsecs)

Data were provided by the HST proposal 14471 taken by the Hubble Heritage Team: Z. Levay, R. Avila, C. Christian, L. Frattare, J. Green, J. Mack, C. Martlin, S. Meyett, M. Mutchler, and S. Porter (STScI/AURA), and K. Noll (NASA/GSFC).

F502N ([O III]), F656N (H-alpha), and F658N ([N II])

NASA, ESA, and the Hubble Heritage Team (STScI/AURA)

This image is a composite of separate exposures acquired by the WFC3/UVIS instrument. Several filters were used to sample various wavelengths. 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:

Blue: F502N ([O III])
Green: F656N (H-alpha)
Red: F658N ([N II])