…the correct answer on the crossword is wrong. “Earthrise” is not a natural phenomenon. The Earth doesn’t rise in the sky of the Moon. The Moon is tidally locked. It only appears to rise from orbit where it was observed by Apollo 8 in 1968.

And pulsars were first discovered in 1968 (or at least that’s when they were named).

So, it recognized that it was a crossword question, but it didn’t give the crossword answer. The answer it did give us technically more correct.