Mars Rover That Can Sing Happy Birthday

This page is the CodyCross answer for the clue below from Germany, Group 2188, Puzzle 4 (Martin Luther).

Question is: Mars Rover That Can Sing Happy Birthday

and the answer is: CURIOSITY

Word Meaning:

CURIOSITY — (uncountable) Inquisitiveness; the tendency to ask and learn about things by asking questions, investigating, or exploring.

Definitions from Wiktionary.