The Stratosphere does not end at 9 miles in the first place. The Stratosphere STARTS at 17 km so if you do the math, you will know that the Stratosphere does not end at 9 miles.
Secondly, the Stratosphere ends at 17 km because that's where the Mesosphere starts.
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The stratosphere does not have a definitive upper boundary, but it generally extends up to about 31 miles above the Earth's surface. The 9-mile mark you might be referring to is where the troposphere transitions into the stratosphere, known as the tropopause, due to changes in temperature and other atmospheric properties.
Stratosphere is the layer above troposphere. Troposphere is the first layer and is below the stratosphere.
After the stratosphere comes the mesosphere, which is the coldest layer of Earth's atmosphere. It extends from about 31 miles to 53 miles above the Earth's surface. In the mesosphere, temperatures can drop as low as -130 degrees Fahrenheit.
Hot air balloons typically fly in the layer of the atmosphere known as the troposphere. The troposphere is the lowest layer of the atmosphere, extending from the Earth's surface up to about 10-15 kilometers (6-9 miles) in altitude.
The stratopause is not a region of the atmopshere. it is the border between the stratosphere below anjd the mesosphere above. It is located 31 to 34 miles above the surface.
stratopause