the final frontier (ðə fáinal frontíer)

Idiom Science fiction

Meaning

the last or most difficult challenge or area of exploration

el último o más difícil desafío o área de exploración (el ultimo o mas dificil desafio o area de exploracion)

"For many scientists, space remains the final frontier."

"Para muchos científicos, el espacio sigue siendo la última frontera." (Para muchos cientificos, el espacio sigue siendo **la ultima frontera**.)

a small sign of possible success or improvement

to receive public attention or recognition

to express anger or frustration so that you feel better

to make someone feel sad or to reduce something

free of charge; paid for by the establishment

to impress or surprise someone greatly