text-facts 39 word-study 36 science 29 chapter-facts 27 character-facts 26 word-usage 20 astronomy 12 physics 11 chemistry 8 verbs 7 feature-launch 6 astrophage 6 pop-culture 5 particles 5 show more... speech 5 astrobiology 5 contractions 5 rocky 4 spectroscopy 3 ryland-grace 3 sections 3 eva-stratt 3 exoplanets 3 nouns 3 astronauts 3 trailer 3 biology 3 petrova-line 2 eridian-numbers 2 star-trek 2 40-eridani 2 venus 2 punctuation 2 atmosphere 2 dimitri-komorov 2 tau-ceti 2 beatles 2 quotes 2 martin-dubois 2 jwst 1 gravity 1 determiners 1 marissa 1 unicode 1 grace-kids 1 adjectives 1 sandra-elias 1 dr-browne 1 prepositions 1 minister-voigt 1 ms-xi 1 justice-spencer 1 ursula-k-le-guin 1 dr-lokken 1 music 1 bob-redell 1 chinese 1 russian 1 ryan-gosling 1 similes 1 easton 1 francois-leclerc 1 invented-words 1 dr-lamai 1 psychology 1 annie-shapiro 1 possessives 1 olesya-ilyukhina 1 yao-li-jie 1 antarctica 1 climate 1 geography 1 steve-hatch 1 pronouns 1 genetics 1