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: [[Supernova]]e: What is the exact mechanism by which an implosion of a dying star becomes an explosion?
; [[Ultra-high-energy cosmic ray]]<ref name = "newscientist" />: Why is it that some cosmic rays appear to possess energies that are impossibly high (the so called ''[[Ultra-high-energy cosmic ray|Oh-My-God particle]]''), given that there are no sufficiently energetic cosmic ray sources near the [[Earth]]? Why is it that (apparently) some cosmic rays emitted by distant sources have energies above the [[Greisen-Zatsepin-Kuzmin limit]]?<ref>Open Questions, Cosmology and Astrophysics, item 12</ref><ref>newscientistspace item 3</ref>
==See also==
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*[[Unsolved problems in physics]]
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==References==
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