Planet nine: References & Edit History
Article Contributors
Primary Contributors
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Fred Frommer
Fred Frommer is a sports historian, author, and writer who has written for a host of national publications.
Other Encyclopedia Britannica Contributors
Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Article title updated for style. | Nov 09, 2026 | ||
| Modified link of Web site: IOPscience - The Astronomical Journal - The Orbit of Planet Nine. | Oct 15, 2026 | ||
| Add new Web site: BBC - If Planet Nine exists, why has no one seen it? | Jul 10, 2026 | ||
| Add new Web site: Dordt Digital Collections - Hunt for Planet Nine: Atmosphere, Spectra, Evolution, and Detectability (PDF). | Jan 23, 2026 | ||
| Add new Web site: IOPscience - The Astronomical Journal - The Orbit of Planet Nine. | Nov 27, 2025 | ||
| Add new Web site: CNN - Planet 9: Inside the search for a hidden planet in our solar system. | Apr 11, 2025 | ||
| Add new Web site: LiveScience - Planet Nine: Is the search for this elusive world nearly over? | Mar 01, 2025 | ||
| Add new Web site: NASA Science - Is Planet X Real? | Jan 17, 2025 | ||
| Add new Web site: Space.com - Planet Nine: Theories About the Hypothetical Planet. | Oct 26, 2024 | ||
| New article added. | Sep 18, 2024 |
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