More general punctuation issues for this chapter:

• The word "Roberts" appears several times, and in every case needs an apostrophe so it should as Robert's in those cases.

• You use "Apollo 11" and "Apollo-11", as well as "moon lander" and "moon-lander". Hyphenation needs to be consistent with phrases and is typically a style preference; however in these two specific cases the correct usage of these phrases is without the hyphen (i.e. Apollo 11 and moon lander).