The earth's atmosphere does not abruptly stop.
It gradually gets thinner and thinner.
For example, satellites in low earth orbits -- arguably in "space" -- experience much more drag than satellites in higher, geosynchronous orbits. So, you just have to define a distance as the edge of the sky and the beginning of space. Here is a commonly accepted definition; read the rest of the article by following the link:
"The Kármán line is an internationally designated altitude commonly used to define outer space. According to definitions by the Fédération Aéronautique Internationale (FAI), the Karman or Kármán line lies at a height of 100 km (about 62 miles) above Earth's surface (ie. in technical terms 100 km above mean sea level).
It was named after Theodore von Kármán.
Around this altitude the Earth's atmosphere becomes negligible for aeronautic purposes, and there is an abrupt increase in atmospheric temperature and interaction with solar radiation...."