- A source of information and products about solar alignments and ancient astronomical observatories and monuments in harmony with seasonal rhythms and terrestrial cycles.
- Complete S Oxley DPhil thesis available in several formats for this alternative theory of planetary formation, first proposed in 1964 by M M Woolfson.
- The pros and cons of planetary protection policy. Do Martian microbes rain down on Earth as Robert Zubrin suggests? NASA Planetary Protection Officer John Rummel responds.