Earth may have been seeding Venus with life for billions of years

The theory of panspermia proposes that life, or the ingredients needed for it, can spread throughout the cosmos aboard asteroids, comets, and other rocky objects. When life develops on a planet, powerful impacts can blast material from its surface into space, potentially carrying microscopic organisms or organic compounds to other worlds. Scientists have long debated whether this kind of transfer may have occurred between Earth and Mars (in both directions). More recently, renewed interest in the possibility of microbial life within Venus' thick cloud layers has expanded that discussion to include Earth, Venus, and Mars.