text-facts 37 word-study 35 science 27 chapter-facts 25 character-facts 24 word-usage 18 astronomy 12 physics 11 chemistry 8 feature-launch 6 astrophage 6 verbs 6 particles 5 speech 5 show more... astrobiology 5 contractions 5 pop-culture 4 rocky 4 spectroscopy 3 ryland-grace 3 sections 3 exoplanets 3 trailer 3 petrova-line 2 eridian-numbers 2 star-trek 2 40-eridani 2 venus 2 eva-stratt 2 punctuation 2 atmosphere 2 nouns 2 tau-ceti 2 astronauts 2 quotes 2 biology 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 dimitri-komorov 1 justice-spencer 1 ursula-k-le-guin 1 dr-lokken 1 music 1 bob-redell 1 chinese 1 russian 1 beatles 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