The story was part of Williamson's Seetee series, although not incorporated into the novels. American geographer Richard Cathcart successfully lobbied for formal recognition of the verb "to terraform", and it was first included in the fourth edition of the Shorter Oxford English Dictionary in 1993.
- "Jack Williamson". Symmetry Magazine. Retrieved 12 August 2014.
- "Science Fiction Citations: terraforming". Jesse Word. Retrieved 12 August 2014.
- "Collision Orbit". ISFDB. Retrieved 12 August 2014.
- *Fogg, Martyn J. (1995), Terraforming: Engineering Planetary Environments, SAE, pp. 9, 16, ISBN 1-56091-609-5.
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