33K views · 1.9K reactions | Where does space begin? Well, it depends. There’s no sharp boundary that marks the end of atmosphere and beginning of space. But no matter where you draw the line in the sand — or the air — Earth’s atmosphere is full of all kinds of interesting stuff. That’s why scientists like Doug Rowland are studying its many layers: https://go.nasa.gov/3JPXbhW | NASA - National Aeronautics and Space Administration | Facebook