How to facilitate contact? Recall the dilemma: direct physical contact with ET or more indirect radio communication. People or Photons? People have mass and that requires enormous amounts of energy to accelerate.
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At higher speeds for our spacecraft, the particles in the ISM are now moving at enormous velocities relative to you.
If your spaceship is moving at 99% the speed of light, the kinetic energy of a particle in the ISM will seem like a very energetic bullet and could do serious damage to the spacecraft … shields anyone?!