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In 1964, Clyde Tombaugh shared this story with his class on planetology (which Walter T. Brown attended): he proposed to [[NASA]] that they send him on a one-way mission to Mars. He did not propose to soft-land. He was prepared to ''crash-land,'' though it meant certain death, and report his impressions as he descended. Aghast NASA officials rejected his proposal. Brown guesses that NASA would never have wanted the bad publicity from sending a living human [[astronaut]] on a suicide mission. Tombaugh made no secret of his irritation with NASA for that refusal.<ref name=Brown>Hurlbut TA, correspondence with Walter T. Brown, Jr., 10 August 2015.</ref>

In 1964, Clyde Tombaugh shared this story with his class on planetology (which Walter T. Brown attended): he proposed to [[NASA]] that they send him on a one-way mission to Mars. He did not propose to soft-land. He was prepared to ''crash-land,'' though it meant certain death, and report his impressions as he descended. Aghast NASA officials rejected his proposal. Brown guesses that NASA would never have wanted the bad publicity from sending a living human [[astronaut]] on a suicide mission. Tombaugh made no secret of his irritation with NASA for that refusal.<ref name=Brown>Hurlbut TA, correspondence with Walter T. Brown, Jr., 10 August 2015.</ref>

But NASA, the Johns Hopkins University Applied Physics Laboratory, and the Southwest Research Institute did, finally, oblige Tombaugh, though posthumously. They collected one U.S. Customary [[ounce]] of his ashes, sealed them in a canister, and installed this on the upper deck of the New Horizons probe. Alan Stern, the lead investigator, inscribed it thus:{{cquote|Interred herein are remains of American Clyde W. Tombaugh, discoverer of Pluto and the solar system's "third zone." Adelle and Muron's boy, Patricia's husband, Annette and Alden's father, astronomer, teacher, punster, and friend: Clyde W. Tombaugh (1906-1997).<ref name=CNN>Mullen J, "[http://www.cnn.com/2015/07/13/us/nasa-pluto-new-horizons-clyde-tombaugh-ashes/ Pluto discoverer's ashes are aboard New Horizons probe]," [[Cable News Network]]. Published 14 July 2015. Retrieved 5 August 2015.</ref>}}

But NASA, the Johns Hopkins University Applied Physics Laboratory, and the Southwest Research Institute did, finally, oblige Tombaugh, though posthumously. They collected one U.S. Customary [[ounce]] of his ashes, sealed them in a canister, and installed this on the upper deck of the New Horizons probe. Alan Stern, the lead investigator, inscribed it thus:{{cquote|Interred herein are remains of American Clyde W. Tombaugh, discoverer of Pluto and the solar system's "third zone." Adelle and Muron's boy, Patricia's husband, Annette and Alden's father, astronomer, teacher, punster, and friend: Clyde W. Tombaugh (1906-1997).<ref name=CNN>Mullen J, "[https://www.cnn.com/2015/07/13/us/nasa-pluto-new-horizons-clyde-tombaugh-ashes/ Pluto discoverer's ashes are aboard New Horizons probe]," [[Cable News Network]]. Published 14 July 2015. Retrieved 5 August 2015.</ref>}}

== Enduring legacy ==

== Enduring legacy ==