showed spinning spirals

When the power came back on, I showed Rhonda the short video of a spiral galaxy spinning. She concurred. There's a strong impression of water running down a drain.



Wish I knew how to make a video loop on YouTube.

Explained that the galaxy on the left is spinning at an expected rate, with speeds tailing off the further we are from the centre; the right spiral portrays the observed speeds, where the outer arms are travelling faster than expected.