A Tidal Galaxy "A previously unsuspected tidal dwarf galaxy candidate appears only in the ultraviolet, indicating the presence of many hot young stars as seen in this cool space Image. IC 4970, the small disk galaxy interacting with NGC 6872, is located above the spiral’s central region. The spiral is 522,000 light-years across from the tip of one outstretched arm to the tip of the other, which makes it about five times the size of our home galaxy, the Milky Way
"This Hubble image is one of several, including the Ultra Deep Field, which peer into seemingly empty space, leaving the camera shutter open for hours, and reveal that billions of galaxies made up of billions of stars fill our skies in every direction as far as we can possibly see, separated by almost unimaginable distance and time, yet still reachable, visible as an image of their long-ago selves."
NGC 4725 is a member of the Coma-Sculptor galaxy cluster and lies 12.6 Mpc away from Earth (Gibson et al. 2009, ApJ, 512, 48). This galactic gem is believed to be tidally interacting with the neighbour galaxy NGC 4747 (outside the pictured field), as a neutral hydrogen plume pointing towards NGC 4725 suggests. In the optical,NGC 4725 is dominated by a single spiral arm that seems to originate from an inner ring rich in newborn stars and conspicuous HII regions (in red in the image).