Good question. The author didn't explore deep space. I believe it was related to terrestrial objections, but that is an interesting thought. Since nothing has e

Good question. The author didn't explore deep space. I believe it was related to terrestrial objections, but that is an interesting thought. Since nothing has ever been that far out I think it is quite impossible to say for certain, but I guess there's no reason to assume the microparticles per cubic meter are any different than inside the solar system. NASA talks about space dust here [1] and how it literally tore apart Mariner. But maybe that is just dust orbiting the sun and not something interstellar. [1] https://www.nasa.gov/vision/universe/watchtheskies/meteor_cloud.html https://www.nasa.gov/vision/universe/watchtheskies/meteor_cl...