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Interstellar solar sails hit a strange problem at 75% of light speed
Science Daily • • science
Key Points:
- Researchers from the Harbin Institute of Technology have found that at speeds above 75% of the speed of light, diffuse scattering of laser light on a solar sail can produce a drag effect, reducing propulsion efficiency.
- The study breaks down the forces from photons on a solar sail into incident light, specular reflection, and diffuse scattering, with the latter becoming a source of drag due to relativistic light aberration at high velocities.
- As the sail approaches relativistic speeds, the Doppler effect lowers the frequency of incoming light, diminishing thrust from all photon interactions and making further acceleration increasingly difficult.
- The research models an idealized mirror sail and does not account for real-world challenges like thermal limits, interstellar gas drag, or material complexities, though advanced metamaterials might mitigate some issues.
- While interstellar solar sails remain theoretical and face many obstacles, understanding these high-speed radiative dynamics is crucial for future designs of spacecraft capable of traveling to other stars.
