* Astronomy

The X-15 Research Airplane reached an altitude of 106,010 metres on the 19th July, 1963.
This was the first X-15 flight over 100 km (a height known as the Karman line), which made the pilot Joe Walker the first US civilian in space.

Maximum Speed - 5,971 km/h.
Maximum Altitude - 106,010 m.

Read more



+ X-15: Extending the Frontiers of Flight [Kindle, Kindle DX] 
NOTE: CTRL-click to save file (Mac and PC).

+ X-15: Extending the Frontiers of Flight [Sony Reader] 
NOTE: Ctrl-Click to save file (Mac), or for the PC, left-click to open file (it takes a moment to load) and then save file to your desktop.