In space, we do see a sea of photons - it is variously called the Cosmic Microwave Background Radiation (CMBR) or Sunlight, depending on its spectrum and source.
The CMB is a cosmic background radiation
Cosmic background radiation is electromagnetic radiation
I am not referring to photons traveling at 'c'. I am referring to the sea of photons which fill 'empty' space analogous to the H2O molecules which fill the oceans.
It is the sea of photons filling 'empty' space which are displaced by the particles of matter the Earth consists of. It is the sea of photons displaced by the Earth pushing back and exerting pressure toward the Earth which is gravity.
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