"I thought I'd better check this third plate, which is another date, see if there's an image there in the right place that would be consistent with the images on the other plates. That was the final proof"
About this Quote
The sentence is built like a checklist, and that’s the point. “Another date” signals the core logic of the hunt: if an object shifts position against fixed stars across time, it’s real, not a scratch, not a defect, not wishful seeing. The phrase “in the right place” is almost comically modest for what’s at stake, but it captures the subtext of early 20th-century observational science: the universe doesn’t announce itself; you catch it by catching yourself. Tombaugh is narrating the discipline of not being fooled by your own pattern hunger.
Calling it “the final proof” lands with a quiet authority because it’s earned, not asserted. Proof here isn’t philosophical certainty; it’s the practical threshold where skepticism can stop. The context matters: Tombaugh was a young, largely self-taught observer at Lowell Observatory, tasked with finding “Planet X” through painstaking comparison of photographic plates. His credibility depended on not overselling. The quote preserves the ethos of science at its best: restraint, repetition, and the willingness to let a third plate veto your excitement.
Quote Details
| Topic | Science |
|---|---|
| Source | Help us find the source |
| Cite |
Citation Formats
APA Style (7th ed.)
Tombaugh, Clyde. (2026, January 15). I thought I'd better check this third plate, which is another date, see if there's an image there in the right place that would be consistent with the images on the other plates. That was the final proof. FixQuotes. https://fixquotes.com/quotes/i-thought-id-better-check-this-third-plate-which-148702/
Chicago Style
Tombaugh, Clyde. "I thought I'd better check this third plate, which is another date, see if there's an image there in the right place that would be consistent with the images on the other plates. That was the final proof." FixQuotes. January 15, 2026. https://fixquotes.com/quotes/i-thought-id-better-check-this-third-plate-which-148702/.
MLA Style (9th ed.)
"I thought I'd better check this third plate, which is another date, see if there's an image there in the right place that would be consistent with the images on the other plates. That was the final proof." FixQuotes, 15 Jan. 2026, https://fixquotes.com/quotes/i-thought-id-better-check-this-third-plate-which-148702/. Accessed 13 Feb. 2026.


