ALS, two pages, 8.5 x 11, New Mexico State University, Department of Astronomy letterhead, July 2, 1991. Handwritten letter to John Adams of Toronto, discussing Pluto's characteristics and detection, in part: "It is very cold on Pluto, mean - 380 degrees F below zero. Pluto's light is very faint, = 1 candle at a distance of 200 miles. There are over 15 million stars as bright or brighter than Pluto, which just looks like a star…As to finding a possible 10th planet, see my 2-page article in the April 1991 issue of Sky and Telescope magazine. The big problem is too many star images have to be viewed for shift in position. Each of my plates taken of the Milky Way regions recorded 200,000 to 1 million star images! The non-Milky Way contained about 50,000." In fine condition.
This item is Pre-Certified by PSA/DNA
Buy a third-party letter of authenticity for
$30.00
*This item has been pre-certified by a trusted third-party authentication service, and by placing a bid on this item, you agree to accept the opinion of this authentication service. If you wish to have an opinion rendered by a different authenticator of your choosing, you must do so prior to your placing of any bid. RR Auction is not responsible for differing opinions submitted 30 days after the date of the sale.
We use cookies on this site to improve your experience. By using this site, you accept our use of cookies. To learn more, please see our Privacy Policy.
