Where Does Space Begin? We Asked a NASA Expert

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
n this video, we ask a NASA expert the question that has puzzled many people for centuries: Where does space begin? The answer, as it turns out, is not as simple as you might think.
The expert explains that there is no clear boundary between Earth's atmosphere and outer space. The atmosphere gradually thins out as you go higher in altitude, until eventually there is not enough air to support human life. This point is often referred to as the Karman line, and it is located about 62 miles (100 kilometers) above Earth's surface.
However, the Karman line is not a hard and fast boundary. In fact, the atmosphere continues to thin out for hundreds of miles above the Karman line. So, in a sense, we are all living in space, even though we don't feel like it.

The expert goes on to explain that the boundary between Earth's atmosphere and outer space is further complicated by the fact that the Earth's magnetic field extends far out into space. The magnetic field protects us from harmful radiation from the Sun, and it also helps to shape the aurora borealis and aurora Australis.
So, where does space begin? The answer is that it depends on how you define it. If you define space as the point where there is no longer enough air to support human life, then space begins at the Karman line. However, if you define space as the point where the Earth's atmosphere ends and outer space begins, then the answer is a lot more complicated.
We hope you enjoyed this video!