Clyde Tombaugh
The Astronomer Who Discovered Pluto
Clyde Tombaugh found Pluto by comparing photographic plates one pair at a time, searching for a tiny point that moved against the stars.
Lived
1906–1997
Known for
Discovery of Pluto
Field
Astronomy
TransitSatellite connection
Pluto and New Horizons
Choose a reading level
Each level uses the same core historical facts with a different depth of explanation.
Biographical details
- Born
- 1906-02-04 - Streator, Illinois, United States
- Died
- 1997-01-17 - Las Cruces, New Mexico, United States
- Education
- University of Kansas (degrees earned after the discovery of Pluto)
Chapter 1
Historical Context
Tombaugh grew up on farms in Illinois and Kansas and built his own telescopes after his family could not afford expensive equipment.
Chapter 2
Technical or Scientific Problem
Find the predicted “Planet X” in a sky crowded with millions of stars and photographic defects.
Chapter 3
Breakthrough and Evidence
In 1930 Tombaugh identified Pluto on plates taken at Lowell Observatory.
Chapter 4
Consequences
His discovery added a new world to the known Solar System and later became part of the story of the Kuiper Belt.
Chapter 5
Modern Connection
New Horizons carried a small portion of Tombaugh’s ashes past Pluto in 2015, linking his discovery directly to modern spacecraft exploration.
Key facts
- Born on 1906-02-04 in Streator, Illinois, United States.
- Known for: Discovery of Pluto
- Primary field: Astronomy
- His discovery added a new world to the known Solar System and later became part of the story of the Kuiper Belt.
- New Horizons carried a small portion of Tombaugh’s ashes past Pluto in 2015, linking his discovery directly to modern spacecraft exploration.
Vocabulary
Discussion questions
- How did the tools and knowledge available in Clyde Tombaugh's era shape the solution?
- What part of this work can be expressed through modern orbital, spacecraft, or astronomical data?
- What limitations or historical context should be kept in mind when evaluating this legacy?
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