Let's 'artificially create complexes that mimic a meteorite that are teeming with robust microscoping lifeforms (that come from a wide variety of extreme niches eg. thermophiles etc.). With nanotechnology, let's impregnate these lifeforms with tracking detection technologies that ideally are powered through the biochemistry of the organism itself. Furthermore incorporate technologies into the genome that trigger notifications upon mitosis/meiosis events (the notification that possible habitation is commencing). Better still, let's see if we can mimic replication with these technologies themselves so they can follow the progeny as well. Let's then bundle these lifeforms up into packages encapsulated in extremely durable and heat resistant spores and include technologies that register impact events which trigger spore 'disintegration' to spew the contents around upon impact.