- "Energy &Humanity:Solar, Nuclear, Fossil" (1988)
- "The Last Nuke" (1994)
- "The Manhattan Project - Now in Color" (1995)
- "Teknologi i dag:Videnskab/Miljø/Kommunikation/Energi" (1995)
- "Beyond:Mars and Beyond" (2003)
- "Vi kunne bo der" (2012)
- "Mars Moon Colony" (2013)
- "Lunar Colony:A Base for Mars Missions" (2014)
- "Fremtiden er her" (2020)
Essays og artikler
- "Et forslag til et kommercielt månetransportsystem" (1989)
- "Project Orion:Nuclear Pulse Propulsion" (1991)
- "Det nye rumkapløb" (1992)
- "Atomkraft til rumudforskning" (1993)
- "The Case for a Lunar Base" (1994)
- "The Future of Space Exploration" (1996)
- "The Moon:A Vital Stepping Stone to Mars" (1998)
- "Mars Direct:A Cheaper, Faster, and More Realistic Way to Mars" (1998)
- "Project Orion:A Case for Nuclear Pulse Propulsion" (2000)
- "Den nukleare mulighed for rumudforskning" (2002)
- "The Case for a Mars Moon Colony" (2004)
- "We Could Live There:Insights in the Design and Sustainability of a Human Settlement on Mars" (2014)
- "The Future of Human Spaceflight" (2016)
- "Vigtigheden af rumudforskning" (2018)
- "The Future of Lunar Exploration" (2020)
Præsentationer og taler
- "The Last Nuke" (American Nuclear Society, 1994)
- "The Future of Space Exploration" (American Astronautical Society, 1996)
- "The Moon:A Vital Stepping Stone to Mars" (International Astronautical Congress, 1998)
- "Mars Direct:A Cheaper, Faster, and More Realistic Way to Mars" (International Astronautical Congress, 1998)
- "Project Orion:A Case for Nuclear Pulse Propulsion" (International Astronautical Congress, 2000)
- "The Nuclear Option for Space Exploration" (International Astronautical Congress, 2002)
- "The Case for a Mars Moon Colony" (International Astronautical Congress, 2004)
- "The Future of Human Spaceflight" (American Astronautical Society, 2016)
- "Vigtigheden af rumudforskning" (American Astronautical Society, 2018)
- "The Future of Lunar Exploration" (American Astronautical Society, 2020)