Supernova Remnant Cassiopeia A - March 2004
About 10,000 light-years 3,100 parsecs away.
This image is 8.5 arcminutes (25 light-years or 7.7 parsecs) wide. The bright remnant shell has a diameter of about 4 parsecs (13 light-years).
This image was created from HST data from the following proposals: 9890 and 10286, both by: R. Fesen (Dartmouth College), J. Morse (NASA Goddard Space Flight Center), J. Raymond (Harvard-Smithsonian Center for Astrophysics), R. Chevalier (University of Virginia), and M. Dopita (Australian National University).
F625W (SDSS r), F775W (SDSS i) , and F850LP (SDSS z)
This image is a composite of many separate exposures made by the ACS instrument on the Hubble Space Telescope using several different filters. Three filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic image. In this case, the assigned colors are:
Blue: F625W (SDSS r)
Green: F775W (SDSS i)
Red: F850LP (SDSS z)
Image of the supernova remnant Cassiopeia A (Cas A) taken with the Hubble Space Telescope Advanced Camera for Surveys in March 2004.