Sentence:  By following the roadmap suggested by Godunov himself, the next step in order to reduce truncation errors in a context of large gradients should be to set up moving mesh methods; a suggestion from the man who created the scheme by means of which were achieved computations of the Apollo <WSD>spatial</WSD> vehicle during its reentry into Earth's atmosphere [20], is most probably worth being worked out! 
Meaning of the word marked with <WSD> tags:  Pertaining to (outer) space.