Interplanetary infection

Some years ago I wondered if Mars could be infected from Earth and then revisited the question, with the likely answer being "no." Another group decided to investigate life traveling to Venus instead.

That's "downhill," so you don't need as much energy to launch the bits of bacteria-laden rock, so the odds of it being sterilized in the blast are minutely smaller. OTOH, Venus isn't exactly the easiest place to live. Maybe some extremophile bacteria could survive, if there was something to "eat." Some bacteria survive here by oxiding using sulfur, but something had to produce the available sulfur in the first place. (geological chemistry? I don't know the mechanism) A huge amount of what's around us is shaped by life: O2 in the atmosphere, for instance.

Venusian microscopic life doesn't seem impossible--high up. Given what we know now. Maybe something will change the picture later...