What is the most mesmorising thing you have see through a telescope?

Question: What is the most mesmorising thing you have see through a telescope?
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Asked by yafghani to Nick on 11 Mar 2014.
- Nick Wright answered on 11 Mar 2014:
  
  I saw the moons of Jupiter going round the planet Jupiter. Because the moons go round the planet quite quickly you can actually see some movement through a telescope if you watch it for a whole evening. Its really amazing because we’re not used to seeing things in astronomy moving that quickly. If you ever get the chance to look through a telescope I’d highly recommend looking at the planet Jupiter!

Question: What is the most mesmorising thing you have see through a telescope?