Can we use the momentum of light to propagate spacecrafts in space?

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    Light Momentum Space
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SUMMARY

The discussion centers on the feasibility of using light's momentum for spacecraft propulsion, specifically through concepts like solar sails. Participants highlight that light exerts force only when it interacts with an object, confirming the theoretical basis for propulsion. Additionally, the conversation references the application of light's momentum in triggering hydrogen bombs, illustrating its practical implications in high-energy physics. Overall, the consensus leans towards the theoretical viability of light propulsion, with practical applications still under exploration.

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  • Basic knowledge of radiation pressure
  • Awareness of thermonuclear weapon mechanics
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Hrithik mudaliar
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as we know light has momentum so theoretically we can use it but is it practical?
(also this is it that light only exerts force if incident on something?)
 
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https://en.wikipedia.org/wiki/Solar_sail

220px-Solarsail_msfc.jpg
 

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Hrithik mudaliar said:
as we know light has momentum so theoretically we can use it but is it practical?
(also this is it that light only exerts force if incident on something?)

I would say "actual" rather than "practical", but the hydrogen bomb is triggered by use of light's momentum.
https://en.wikipedia.org/wiki/Thermonuclear_weapon#Radiation_pressure
 
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