It is a well-known hypothesis (but not fully agreed upon) by astrobiologists that extraterrestrial life could have hitched a ride on some interstellar cometary objects like 3I/Atlas (the unusual elongated comet that entered our Solar System recently) that have entered ours and other solar systems. This theory is known as panspermia - and both Carl Sagan and Avi Loeb have postulated that the biological seeds of intelligent life may have arrived via these comets spreading the material in stellar systems.
Loeb has even suggested that extraterrestrials may be spreading life across the galaxy as a fertilization mission. You can read more here: Did 3I/ATLAS Deliver Extrasolar Life to Our Backyard?
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