Where else? Venus' habitable period, if it existed, was quite short. It's gravity is also much higher and it is inward in the solar system. Even before it turned into the hell-hole it is now, dynamical models show that it probably sent few rocks our way.
The Moon appears to have formed without the resources to sustain life as we know it. There are great candidates for life in the outer solar system (Europa, Enceladus, Titan), but ejecta from these mostly get eaten up by the giant planets.
The only likely candidates for solar system origin panspermia is Mars, and maybe Ceres. Only Mars (and Earth) had the long wet period with open oceans, geothermal heat sources, plate tectonics, and sizable atmosphere. Mars isn't the only option, but the odds are way, way higher.
At least for life as we know it. But the point of panspermia is that it would be life as we know it ;)
The Moon appears to have formed without the resources to sustain life as we know it. There are great candidates for life in the outer solar system (Europa, Enceladus, Titan), but ejecta from these mostly get eaten up by the giant planets.
The only likely candidates for solar system origin panspermia is Mars, and maybe Ceres. Only Mars (and Earth) had the long wet period with open oceans, geothermal heat sources, plate tectonics, and sizable atmosphere. Mars isn't the only option, but the odds are way, way higher.
At least for life as we know it. But the point of panspermia is that it would be life as we know it ;)