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References
- ↑ Henry, Richard. "Richard Conn Henry" (PDF). Physics & Astronomy | Johns Hopkins University.
- ↑ "Richard Conn Henry: Professional Biography" (PDF). Physics & Astronomy | Johns Hopkins University.
- ↑ "Pluto Not a Planet, Astronomers Rule". National Geographic News. 2006-08-24. Retrieved 2019-02-24.
- ↑ "Down With Pluto!". henry.pha.jhu.edu. Retrieved 2019-02-24.
- ↑ "SETI on the Ecliptic". www.centauri-dreams.org. Retrieved 2019-02-24.
- ↑ "A Calendar that Never Changes and the World on the Same Time?". www.accuweather.com. Retrieved 2019-02-24.
- ↑ "The Streit Council – Board of Directors". streitcouncil.org. Retrieved 2019-02-24.
