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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.
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The following is a list of notable unsolved problems grouped into broad areas of physics. [1]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.
Though some of the listed topics continue to be investigated scientifically, others were only subject to scientific research in the past and today are considered refuted, but resurrected in a pseudoscientific fashion. Other ideas presented here are entirely non-scientific, but have in one way or another impinged on scientific domains or practices.
List of topics in space; topics as related to outer space. Accidents in space; Animals in space; Architecture in space; Batteries in space; Christmas in space;
Criticism of space exploration encompasses various arguments against investing in space programs and missions. Opponents point to the substantial financial costs, suggesting that funds allocated for space exploration could be better spent addressing urgent issues on Earth, such as poverty, healthcare, education, and environmental degradation.
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Articles on this list should be checked from time to time to monitor developments in the presentation of the issues. Use the "related changes" link to quickly review changes to these articles. Discussions about those controversies should be limited to the relevant Talk pages. For more information, see Wikipedia:Controversial articles.