Panspermia Theory Predicts Life Is Ubiquitous
But the most common forms of life in the cosmos would be microbes, as is the case on Earth.
The number of technologically advanced civilizations is thought to be very uncertain, mostly because no one knows the probabilities for the very different paths of self-destruction versus emergent stability. Possibly the former is the norm, and certainly we Earthlings have been heading in that direction with accelerating pace in recent decades.
The idea that we are unique and totally alone in the Universe is profoundly anti-Copernican, and philosophically repugnant in general. This is especially so in an infinite cosmos.
PS: Tardigardes, like some microbes, have been found to withstand “extreme temperatures, intense radiation and the vacuum of space”.