Yes, SPACE is a Scrabble word!

Letter values in Scrabble US: S 1, P 3, A 1, C 3, E 1.

Is it a valid word?

SPACE is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the unlimited expanse in which everything is located
an empty area (usually bounded in some way between things)
an area reserved for some particular purpose
any location outside the Earth's atmosphere
a blank character used to separate successive words in writing or printing
the interval between two times
a blank area
one of the areas between or below or above the lines of a musical staff
(printing) a block of type without a raised letter; used for spacing between words or sentences

SPACE was the Wordle answer on Sept. 1, 2023 (#804). Stuck on today’s? Use the Wordle helper.

Also: outer space, blank space.