Does photon loose energy/mass during travel?

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SUMMARY

Photons do not lose energy or mass while traveling through a vacuum, maintaining their speed and energy levels. However, when photons enter different mediums such as the Earth's atmosphere, glass, or water, they experience a reduction in speed due to interactions with the medium, which can be interpreted as a loss of energy. This phenomenon is not due to resistance in the traditional sense but rather the result of the photon being absorbed and re-emitted by the atoms in the medium. The concept of quantization means that photons exist as discrete packets of energy, which cannot be partially absorbed.

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San K
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Let's say we track a photon... starting from sun and reaching earth.

When the photon moves through space (maybe because there is vacuum) it looses no/little energy. Now... when it enters atmosphere?

When it goes through glass plate? or through ocean or through water vapour? Does it slow down?

Is there not resistance?

however a quanta is the lowest possible energy amount, thus is can only be all or nothing?
 
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