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  2. List of unsolved problems in astronomy - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    This article is a list of notable unsolved problems in astronomy. Problems may be theoretical or experimental. Theoretical problems result from inability of current theories to explain observed phenomena or experimental results. Experimental problems result from inability to test or investigate a proposed theory.

  3. Category:Unsolved problems in astronomy - Wikipedia

    en.wikipedia.org/wiki/Category:Unsolved_problems...

    Pages in category "Unsolved problems in astronomy" The following 42 pages are in this category, out of 42 total. This list may not reflect recent changes. ...

  4. List of unsolved problems in physics - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result. The others are experimental, meaning that there is a difficulty in creating an experiment to test a proposed theory or investigate a phenomenon in greater detail.

  5. Inside the 12 Greatest Unsolved Disappearances of All Time

    www.aol.com/inside-12-greatest-unsolved...

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  6. The weirdest unsolved mysteries you probably haven't heard before

    www.aol.com/news/2014-10-29-the-weirdest...

    From the Kentucky Meat Shower to Exploding Head Syndrome, these unsolved mysteries give us the creeps. Perhaps the scariest one of all is the Dyatlov Pass Incident: hikers went missing while ...

  7. Category:Unexplained phenomena - Wikipedia

    en.wikipedia.org/wiki/Category:Unexplained_phenomena

    Internet mysteries (1 C, 12 P) L. Ley lines (7 P) S. Unidentified sounds (11 P) U. Unidentified flying objects (5 C, 8 P) W. Anomalous weather (19 P)

  8. American History's Eeriest Unsolved Mysteries

    www.aol.com/american-historys-eeriest-unsolved...

    The murderer in the crawl space. In 1915 in Niagara, North Dakota, six bludgeoned bodies were found in the crawl space of a home belonging Eugene Butler. Butler, a recluse, had died previously in ...

  9. Lists of unsolved problems - Wikipedia

    en.wikipedia.org/wiki/Lists_of_unsolved_problems

    List of unsolved problems may refer to several notable conjectures or open problems in various academic fields: Natural sciences, engineering and medicine