This colorful image of the Bubble Nebula – also known as NGC 7635 – was taken by the Hubble Telescope in 2016 with the Hubble’s WFC3 instrument package. The Bubble Nebula is believed to be about 8,000 light years distant and to have been formed by the intense stellar winds of the bright star to the left of center which has created a nearly symmetrical bubble in the surrounding molecular cloud which resists the bubble’s expansion. The intense ultraviolet radiation of the central star causes the surrounding gasses to emit light in specific wavelengths which was then captured by the Hubble Telescope and its specialized filters. This image is composed of three emission line filter images – N II, Hydrogen alpha and O III – which were then mapped to red, green and blue respectively and then combined as a false color image. Follow this link for more information on the Bubble Nebula.
The image above is a high resolution view of the of the much larger mosaic which highlights the star which is the source of the Bubble Nebula and the surrounding cometary knots. The image below is a view of the entire four panel mosaic which was assembled by the Hubble telescope image processors. The calibrated and aligned image data is available at this page for anyone who wants to try their hand at processing it.
Click on the link below for a larger version of the full frame image. Follow this link to my Astrobin page for a higher resolution version. Click on the second image below for the high resolution view of the cometary globules.