Devout, to da Vinci, 3 letters
Early Californian Pico, 3 letters
Spanish author Baroja y Nessi, 3 letters
NASA planetary probe, 5 letters
Certain subatomic particle, 4 letters
Elementary particle, 4 letters
First meson discovered, 4 letters
Meson with zero spin, 4 letters
Particle made of quark-antiquark pairs, 4 letters
Semistable subatomic particle, 4 letters
Short-lived particle, 4 letters
Subatomic particle that is a nuclear binder, 4 letters
___ 10 (first spacecraft to observe Jupiter), 7 letters
Conestoga wagon passenger, 7 letters
Davy Crockett, e.g., 7 letters
First mission to visit the outer planets, 7 letters
Individual in dock is early arrival (7), 7 letters
Johnny Appleseed was one, 7 letters
NASA program that explored the outer planets, 7 letters
Trailblazing musician, 7 letters
Trailblazing settler, 7 letters
Unmanned planetary probe, 7 letters
Someone who helps to open up a new line of research or technology or art, 7 letters
One the first colonists or settler in a new territory, 7 letters
Started with pi + 1 before 500 (9), 9 letters
Explorers of the unknown, 8 letters
Ones who forge new territory, 8 letters
Emcee's words about a subatomic particle?, 9 letters
Ingredients in subatomic pesto?, 8 letters
Certain subatomic particles, 5 letters
Semistable subatomic particles, 5 letters
Short-lived particles, 5 letters
Short-lived subatomic particles, 5 letters
Some subatomic particles, 5 letters
Subatomic particles, 5 letters
Composer ___ Ilyich Tchaikovsky, 5 letters
First name in Russian composers, 5 letters
Russian composer Tchaikovsky, 5 letters
Tchaikovsky's real first name, 5 letters
Devoted to the divine, 5 letters
Epithet for Louis I, with the, 5 letters
Falsely earnest or sincere, 5 letters
Observant, in a way, 5 letters
Religiously devoted, 5 letters
With dutiful reverence, 7 letters
With great devotion, 7 letters
Righteousness by virtue of being pious, 9 letters
An ax used by mountain climbers for cutting footholds in ice, 6 letters