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In physics, there are four observed [[fundamental interaction]]s (also known as fundam ...ntessence in string theory |journal=Journal of Cosmology and Astroparticle Physics |volume=2012 |issue=7 |page=044 |arxiv=1203.6655 |doi=10.1088/1475-7516/201 ...

In [[astroparticle physics]], an '''ultra-high-energy cosmic ray''' ('''UHECR''') is a [[cosmic ray]] ..., the corresponding limit would be {{val|2.8|e=21|u=eV}}. However, nuclear physics processes lead to limits for iron nuclei similar to that of protons. Other ...

...e spectrum of cosmic rays |journal=Journal of Experimental and Theoretical Physics Letters |volume=4 |pages=78–80 |bibcode=1966JETPL...4...78Z |url=http://www {{unsolved|physics|Why is it that some cosmic rays appear to possess [[energy|energies]] that ...

...derwater acoustics were made which were summarised later in the series ''[[Physics of Sound in the Sea]]'', published in 1946. A sound wave propagating underwater consists of alternating [[Compression (physics)|compression]]s and [[rarefaction]]s of the water. These compressions and r ...

...is all of [[space]] and [[time]]{{efn|name=spacetime|According to [[modern physics]], particularly the [[theory of relativity]], space and time are intrinsica ...|title=Could Feynman Have Said This? |first=N. David |last=Mermin |journal=Physics Today |volume=57 |issue=5 |page=10 |date=2004 |doi=10.1063/1.1768652 |bibco ...