According to astronomers there are between 200 billion and 400 billion stars in the Milky Way. A normal healthy human brain has as many neurons as the low estimate of stars in the galaxy: 200 billion! Pretty impressive when you compare the vastness of space to the size of the human brain.
In fact, the cerebral cortex (the brain's outer layer) is only 2 to 4 millimeters thick, but it alone contains around 10 BILLION neurons!
The number of stars in the Milky Way galaxy really pales in comparison to the number of the brains synapses, connections between the neurons. There are an estimated 125 trillion synapses within the cortex! This means there are 1,500 times as many synapses as there are stars in the Milky Way Galaxy - and that's just in the tiny outer layer of your brain!
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