Oh almost certainly! Earth grown animals have been found alive on the outside of space stations [0]. Dumping a bunch of earth stuff in these places would likely

Oh almost certainly! Earth grown animals have been found alive on the outside of space stations [0]. Dumping a bunch of earth stuff in these places would likely lead to a new ecosystem. So long as there was an energy source, like thermal vents. This is actually a major problem for looking for life elsewhere in the solar system. How do we know it isn't just an Earth grown hitchhiker? Instruments sent to other planets have to be thoroughly cleaned. In theory they could have been seeded as you describe. The problem is, to quote Douglas Arthur, that "space is really, really big"[1]. It's also not great for life, even the hardiest Earth animals can only survive for decades, and it could easily be centuries or millenia until they were deposited anywhere. Additionally the gas giants, due to their mass, act as a big attractor to stray mass. And any biological life adrift is likely to be sucked into one of these, rather than land on an orbiting moon. [0]https://en.wikipedia.org/wiki/Tardigrade https://en.wikipedia.org/wiki/Tardigrade [1]https://en.wikipedia.org/wiki/The_Hitchhiker%27s_Guide_to_the_Galaxy https://en.wikipedia.org/wiki/The_Hitchhiker%27s_Guide_to_th... fiction, doesn't back up any point. But hilarious and correct about the size of space.