space
Where Do You Draw the Line Between the Sky and Space?

On his 108-minute flight in 1961, the Soviet cosmonaut Yuri Gagarin, the first human in space, reached a peak altitude of 327 kilometres (203 miles), after blasting off the planet atop a mighty Vostok rocket. After launch shook his tiny capsule violently, Gagarin experienced the feeling of weightlessness, and saw the curvature of the Earth first-hand. By all accounts, he crossed the mysterious border between the Earth and space. Or did he? It has been more than half a century since Gagarin's historic journey, but there is still no universally accepted definition of where space begins. Read More >>