Most likely through light pressure from their star’s outflow of photons, Zubrin, an astronautical engineer who is founder and president of The Mars Society, told me. This method of bacteria transmission would work best for brighter stars such as F-, G-, and K- spectral type stars. However, Zubrin notes that Red dwarf M-stars, the cosmos’ most ubiquitous, might have a difficult time pushing their bacteria outside their solar systems.

Yet if a bacterial colony was strongly magnetized, as Zubrin noted in a 2017 article posted on the popular space blog, Centauri Dreams, it might be able to act as a miniature magnetic sail. If so, it would, in theory, catch a 500 kilometer-per-second solar wind. That’s more than enough to propel it out of the solar system.

If natural or artificial panspermia were occurring, we would see the same general type of life everywhere, with no evidence of a prior evolutionary history of simpler forms, said Zubrin.

In contrast, if a manufactured microbial solar sail were shot out of the Earth’s gravity by a rocket and released into near-Earth space, it would be blown out of the solar system at approximately Earth’s speed around the Sun, or 30 kilometers-per-second. Thus, it would travel a light year every 10,000 years, and be able to reach nearby stars in less than 50,000 years. And Zubrin says the point is that at least some of these bacteria would survive such a trip. If natural or artificial panspermia were occurring, we would see the same general type of life everywhere, with no evidence of a prior evolutionary history of simpler forms,” said Zubrin.

Could the microbes that surround us actually be encoded with interstellar messages from some far-flung race of space aliens? It’s a question that has been posed for decades by some members of the SETI (Search for Extraterrestrial Intelligence) community. But most recently it was tackled by longtime space advocate Robert Zubrin, at this month’s ‘Breakthrough Discuss 2019’ conference at the University of California at Berkeley.
If natural or artificial panspermia were occurring, we would see the same general type of life everywhere, with no evidence of a prior evolutionary history of simpler forms,” said Zubrin.