- News Home
12 December 2013 1:00 pm ,
Vol. 342 ,
The iconic 125-year-old Lick Observatory on Mount Hamilton near San Jose, California, is facing the threat of closure...
Recent results from the Curiosity Mars rover have helped scientists formulate a plan for the next phase of its mission...
A new, remarkably powerful drug that cripples the hepatitis C virus (HCV) came to market last week, but it sells for $...
In pretoothbrush populations, gumlines would often be marred by a thick, visible crust of calcium phosphate, food...
Evolutionary biologists have long studied how the Mexican tetra, a drab fish that lives in rivers and creeks but has...
Victorian astronomers spent countless hours laboriously charting the positions of stars in the sky. Such sky mapping,...
In an ambitious project to study 1000 years of sickness and health, researchers are excavating the graveyard of the now...
Stefan Behnisch has won awards for designing science labs and other buildings that are smart, sustainable, and...
- 12 December 2013 1:00 pm , Vol. 342 , #6164
- About Us
Tribute to Pluto's Discoverer
23 January 1997 8:00 pm
A memorial service was held today at New Mexico State University for Clyde Tombaugh, the astronomer who discovered Pluto. Tombaugh died on 17 January at his home in Las Cruces. He was 90.
Tombaugh spent much of his youth observing the sky. At the age of 22, he built a 9-inch telescope from discarded farm machinery and parts salvaged from his father's 1910 Buick. When he sent drawings of Jupiter and Mars to the Lowell Observatory in Flagstaff, Arizona, they offered him a job. Tombaugh helped search beyond Neptune for a "Planet X," which astronomer Percival Lowell had predicted based on perturbations in Neptune's orbit.
Using a machine called a blink-comparator, Tombaugh examined hundreds of photos of identical sections of the sky on different nights. In the blink-comparator, a light would rapidly switch between pairs of photos, making stars look fixed. Against this background, a planetary body moving in its orbit would appear to jump. On 18 February 1930, Tombaugh found the mystery planet, which the Lowell staff later named Pluto after the Greek god of the dimly lit underworld Hades.
"He did what some giants couldn't do," says Alan Stern, an astronomer at the Southwest Research Institute in Boulder, Colorado. "He was a very thorough observer." Tombaugh was an iron man, too: At age 90, he attended a lecture at New Mexico State University in a wheelchair, breathing from oxygen tanks. "I was floored by his energy level and his incisive questions," says Stern.
After finding Pluto, Tombaugh discovered six star clusters, two comets, hundreds of asteroids, several dozen clusters of galaxies, and one supercluster. He also earned bachelor's and master's degrees from the University of Kansas. After helping test captured German V-2 rockets in 1946 at White Sands Missile Range, he went to New Mexico State University, where he taught until 1973.
Tombaugh was an active astronomer to the end. When the Smithsonian Institution requested his first 9-inch telescope, Tombaugh demurred, saying he was still using it in his backyard. By his retirement in 1973, Tombaugh had confirmed the length of Mercury's day, measured the swirling vortex of Jupiter's Great Red Spot, and built a telescope in Ecuador to search for rocky debris circling the Earth.