Crossword puzzle clue "earth's outside"

Earth's outside

___ Saknussemm, discoverer of the center of the earth in "Journey to the Center of the Earth"

First president born outside the original 13 colonies

Event outside human control

Goes outside the lines?

"Outside of ___, a book is man's best friend ..." (Groucho Marx)

Sign outside a boarded-up JFK?

Takes outside