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I've got a list of a few of my favorites, and I'm looking for others to add to it. Mine include:

  1. Horseshoe orbit moons (that if observed while on one of them will look like the other moon is about to crash into you, and then it slowly proceeds to go away)
  2. A small visible galaxy
  3. Planet rings/a gas giant with rings
  4. Multi star systems with each star being a different color (possibly even feeding off each other)
  5. Auroras
  6. Floating magnetic islands with waterfalls
  7. Rocheworld/Ring World/Dyson Ring/Dyson Sphere
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closed as primarily opinion-based by Mołot, L.Dutch, Bellerophon, Secespitus, MichaelK Oct 16 '17 at 7:48

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Hello and welcome. Please see help center. Questions where every answer is equally valid are specifically on the "do not ask on this site" list. $\endgroup$ – Mołot Oct 16 '17 at 6:16
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    $\begingroup$ As Mołot said, this question is based entirely upon oponion and as such it will be closed. If you get 20 (I think) rep you can come and ask about it in the chat. chat.stackexchange.com/rooms/17213/the-factory-floor $\endgroup$ – Bellerophon Oct 16 '17 at 6:56