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Reference.org
List of unsolved problems in astronomy
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<p>This article is a <a href="/facts/List_of_unsolved_problems/u9bpE2Xa">list of notable unsolved problems</a> in <a href="/facts/Astronomy/0ArJVM1p">astronomy</a>. Problems may be theoretical or experimental. Theoretical problems result from inability of current <a href="/facts/Scientific_theory/moMsLrUn">theories</a> to explain observed phenomena or experimental results. Experimental problems result from inability to test or investigate a proposed theory. Other problems involve unique events or occurrences that have not repeated themselves with unclear causes. </p>