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• Interacting galaxy
  ...e primary galaxy's [[spiral arm]]s. An example of a major interaction is a galactic collision, which may lead to a [[galaxy merger]]. ...m 2015-04-21 How the Hubble Space Telescope Changed Our View of the Cosmos-Galactic Collisions Photographs]</ref> The extremely tenuous distribution of matter
  12 KB (1,640 words) - 19:51, 4 February 2018
• Arp 220
  ...s about the link between galaxy mergers and AGN, since it is believed that galactic mergers often trigger starbursts, and may also give rise to the supermassiv
  7 KB (1,006 words) - 12:34, 5 February 2018
• 3C 273
  ...terparts, the first being [[3C 48]]. Also, many [[Active Galactic Nucleus|active galaxies]] had been misidentified as [[variable star]]s, including the famo
  11 KB (1,478 words) - 12:28, 5 February 2018
• Centaurus A
  ...est [[Radio galaxy|radio galaxies]] to [[Earth]], so its [[active galactic nucleus]] has been extensively studied by professional astronomers.<ref name="israe ...Stanley |author3=O. B. Slee |title=Positions of Three Discrete Sources of Galactic Radio-Frequency Radiation
  29 KB (4,015 words) - 12:30, 5 February 2018
• Atlas of Peculiar Galaxies
  ...few other galaxies are [[radio galaxies]]. These objects contain [[active galactic nuclei]] that produce powerful jets of gas called [[radio jets]]. The atlas ...nite structure with loosely wound spiral arms and a faint but well-defined nucleus).<ref name="nedngc2857">{{cite web
  76 KB (10,108 words) - 13:04, 4 February 2018
• Non-standard cosmology
  ...f the cosmos|larger scale]] than the previously assumed [[Milky Way galaxy|galactic size]]. Theorists who successfully developed cosmologies applicable to the ...consensus about these ideas amongst cosmologists, but they are nonetheless active fields of academic inquiry.
  41 KB (6,072 words) - 19:16, 4 February 2018
• Hubble Deep Field
  ...ended that the WFPC2 be used to image a "typical" patch of sky at a high [[galactic latitude]], using several [[optical filter]]s. A [[working group]] was set ...the [[Milky Way]]'s disc prevents observations of distant galaxies at low galactic latitudes. The target field had to avoid known bright sources of [[visible
  33 KB (4,612 words) - 12:32, 5 February 2018