When galaxies get close enough to each other, tidal forces can tug entire star systems out of place, distorting the shapes of the interacting pair in sometimes dramatic fashion. When galaxies with active galactic nuclei interact, the result can be spectacular, as in this Hubble Space Telescope view of Arp 282, made up of Seyfert galaxy NGC 169 (bottom) and IC 1559 (top). Hidden in the cores of both galaxies are supermassive black holes, actively feasting on surrounding stars, gas and dust. Delicate streams of matter can be seen visibly connecting the two galaxies in a dramatic, 3D-like demonstration of titanic tidal interactions.
Telescopes combine to push frontier on galaxy clusters
Galaxy clusters are enormous collections of hundreds or even thousands of galaxies and vast reservoirs of hot gas embedded in massive clouds of dark matter. To learn more about clusters, including how they grow via collisions, astronomers have used some of the world’s most powerful X-ray, optical and radio telescopes. The name for this galaxy cluster project is the “Frontier Fields”.
Filling in the blanks in Hubble’s ‘deep field’ view of cosmos
Hubble sees a galactic sunflower
Galactic arms, sunflowers and whirlpools are only a few examples of nature’s apparent preference for spirals. A beautiful example is Messier 63, nicknamed the Sunflower Galaxy, its winding arms shining bright due to the presence of recently formed, blue–white giant stars and clusters, readily seen in this NASA/ESA Hubble Space Telescope image.