A long time ago gravity drew two galaxies together into the gorgeously chaotic state we see above with NGC 6052. Stars from within both of the original galaxies now follow new trajectories caused by the new gravitational effects.
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Is Dark Matter Only the Tip of an Invisible Universe of Unknown Forces?
Have Astronomers Detected a Cosmic String from the Dawn of the Universe?
“Their Source a Mystery” -The Wild and Scenic Rivers of Ancient Mars
Strange Black Holes of the Infant Universe
Higgs Boson Portal to the Dark Sector of the Universe –“A Breathtaking World”
The Search for Axions – Detection Will Have Profound Implications
Will We Image Planet Nine Within the Next Decade? 
NASA Scientists: On What the Perseverance Mars’ Rocks Return Samples Could Tell Us