Another useful article by Henry Spencer on the subject: "Rockets, not air-breathing planes, will be tomorrow's spaceships" (New Scientist, 2009) https://web.

Another useful article by Henry Spencer on the subject: "Rockets, not air-breathing planes, will be tomorrow's spaceships" (New Scientist, 2009) https://web.archive.org/web/20101017031109/https://www.newscientist.com/blogs/shortsharpscience/2009/03/rockets-not-air-breathing-plan.html https://web.archive.org/web/20101017031109/https://www.newsc...