Panspermia

Panspermia is the scientific hypothesis that life on Earth may have originated from microorganisms or organic molecules that arrived from space. This can happen through comets, meteorites, or other celestial objects carrying tiny life forms or building blocks of life, which then seed planets like Earth. The idea suggests that life didn't spontaneously form here but was transferred from elsewhere in the universe. While it doesn't explain how life first started, it offers a potential pathway for the spread of life across the cosmos, emphasizing the interconnectedness of planets and life’s potential ubiquity.