NASA releases image of the Cartwheel Galaxy taken with the NASA/ESA (European Space Agency) Hubble Space Telescope. The galaxy was first spotted on wide field images from the U.K. Schmidt telescope and then was studied in detail using the Anglo-Australian Telescope.
ESA/Hubble & NASA
The Galaxy is lying about 500 million light-years away in constellation of Sculptor. The cartwheel shape of galaxy is due to violent galactic collision. The smaller galaxy passed through large disk galaxy that produced shockwaves and moved gas and dust like ripples produced by throwing stone in water giving intense star formation at the ring. The outermost ring of galaxy is 1.5 times the size of our Milky Way.
This image is based on earlier Hubble Data of Cartwheel Galaxy that was reprocessed in 2010 bringing out more details.