The man swinging a light from a string to his finger was illustrating how “dark matter” provides enough gravity to keep a spinning galaxy in place. Of course, he said you have to imagine he’s not there. It’s really dark matter doing the job! Or it can be God, whom we can’t see, doing the job. Either way, the cosmologist has to explain what dark matter is and how it’s able to accomplish the task.
godmadeknown 
The man swinging a light from a string to his finger was illustrating how “dark matter” provides enough gravity to keep a spinning galaxy in place. Of course, he said you have to imagine he’s not there. It’s really dark matter doing the job! Or it can be God, whom we can’t see, doing the job. Either way, the cosmologist has to explain what dark matter is and how it’s able to accomplish the task.
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