Can non-intelligent life naturally evolve the ability to space travel and to live in interplanetary space?

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Panspermia is the idea that extremophiles "hitch a lift", as it were, on ejecta from collisions between celestial bodies. There are a few obstacles, because the microbes would have to survive all three phases of travel:

Launch (as well as the impact event)
Travel in the harsh environment of space
Atmospheric entry and landing, with high temperatures

Extremophiles are really the only types of organisms that could survive such a journey. More complicated organisms (with more needs) would surely die en route.

On Earth, here have been some discoveries of materials related to organic matter that might be evidence of panspermia; see Bell et al. (2015) for one example.

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