Astronaut's Preferred Key on a Keyboard?

This page is the CodyCross answer for the clue below from All Things Water, Group 1286, Puzzle 5 (Drink and Bathe).

Question is: Astronaut's Preferred Key on a Keyboard?

and the answer is: SPACEBAR

Word Meaning:

SPACE BAR — (computing) A key, in the shape of a bar, near the bottom of a keyboard, that generates a space character when pressed.

Definitions from Wiktionary.