This section of Mètode is now twenty years old. To celebrate it, I retrieve a topic I talked about in issue 34: planetary nebulae.

[caption id="attachment_44035" align="alignleft" width="320"] First stage of the Falcon 9 rocket landing on SpaceX's floating platform. / Mètode[/caption] When NASA was founded, the USAF (United States Air Force) was deep into the development of what should be a true spacecraft, the X-20 Dyna Soar, a ship that would