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Clyde W. Tombaugh Autograph Letter Signed

Currency:USD Category:Collectibles / Autographs Start Price:NA Estimated At:100.00 - 200.00 USD
Clyde W. Tombaugh Autograph Letter Signed

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Auction Date:2020 Nov 11 @ 18:00 (UTC-5 : EST/CDT)
Location:15th Floor WeWork, Boston, Massachusetts, 02108, United States
ALS - Autograph Letter Signed
ANS - Autograph Note Signed
AQS - Autograph Quotation Signed
AMQS - Autograph Musical Quotation Signed
DS - Document Signed
FDC - First Day Cover
Inscribed - “Personalized”
ISP - Inscribed Signed Photograph
LS - Letter Signed
SP - Signed Photograph
TLS - Typed Letter Signed
ALS, one page, 8.5 x 11, February 20, 1990. Interesting letter about Pluto, in part: "Referring to the photograph of the discovery sections of Pluto (about the size of a postage stamp from the 14 by 17 inch original plates), Pluto is not Lowell's Planet X. You may like to see the article 'Where is Planet X?' in the December 1989 issue of Sky & Telescope…From my thorough extensive planet search to the 17th magnitude over 2/3rds of the entire sky, no Planet X ever showed up, supposed to equal 6.7 Earth-masses. Pluto has only 1/400th of the mass of the Earth." In fine condition.