ALT This collage shows five ring galaxies captured by Hubble. In the upper left is Arp 147, a pair of ring galaxies that warped each others’ structures. The galaxy on the right is O-shaped and glows with white clumps of newly formed stars. Its central region appears empty. The galaxy to its left is elongated and very hazy, with a swirling blue patch inside its ring. Credit: M Livio et al. (STScI), ESA, NASA. The image in the upper right shows the Cartwheel galaxy, whose clumpy, oval-shaped outer ring is connected by wispy structures to a swirling yellow central region. Credit: ESA/Hubble & NASA. In the lower left is AM 0644-741, whose structure resembles a hard-boiled egg. Its outer ring is elongated and tangled with bunches of gas, dust, and stars. Inside, toward one end, is a hazy cream-colored ball. Credit: NASA/STScI. The lower right image features Zw II 28, a sparkling loop of pink and purple surrounded by clouds of blue-white gas and dust. Credit: ESA/Hubble and NASA.