Seth Shostak Quotes
The stars look the same from night to night. Nebulae and galaxies are dully immutable, maintaining the same overall appearance for thousands or millions of years. Indeed, only the sun, moon and planets - together with the occasional comet, asteroid or meteor - seem dynamic.
Citations
Shostak, Seth. "The Universe is More Dynamic Than You Think." Space.com, Future US, 12 Oct. 2010.
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Note that Da Vinci predated Galileo. One big difference was that Da Vinci did not publish his heretical views, but wrote them in his private notebook. The church authorities likely did not know about his heresy.
Seth Shostak is an American astronomer and author, and is currently the senior astronomer for the SETI Institute.