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This is the context:

Again, the importance of fine-tuning turns on how narrow or how broad the tolerances around fundamental constants, while still being consistent with the formation of stars and planets, and with sufficient time, for the generation and evolution of life.

What's Fine-Tuning in Cosmology?

What is the meaning of "turns on"? Does it mean "revolve on an axis or hinge"? and does the bold "around" is attached to turns on? And another question, why in the last part of the sentence there is no verb? does it mean to be "consistent for"?

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    Did you transcribe this? There seem to be some words missing. Sep 20 '20 at 21:46
  • @MichaelHarvey No. If you go to 18:50 to 19:08, you can see the part. Sep 20 '20 at 21:55
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Here, "turns on" means "is decided by":

turn on

(turn on something) to be the issue, fact, or point that something depends on most

The trial turned on the medical evidence presented by the defence.

Turn on (Macmillan Dictionary)

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