A crater on the planet Mercury has been named after him.
ʌ WORD_BOUNDARY k ɹ eɪ t ə ɹ ɹ WORD_BOUNDARY ɔ n ð ə WORD_BOUNDARY p l æ n ɪ t WORD_BOUNDARY m ɜː k j ʊ ɹ i WORD_BOUNDARY h æ z b iː n WORD_BOUNDARY n eɪ m d WORD_BOUNDARY æ f t ə ɹ WORD_BOUNDARY h ɪ m WORD_BOUNDARY