Life is not improbable.

[Confused Ape]

No, but we're the only species ever to escape the bounds of our own world. I'd say that puts us above the rest.

NASA - Microbial Creatures In Space

Millions of little organisms went with us.

Microbes Survive A Year And A Half In Space

Bacteria collected from rocks taken from the cliffs at the tiny English fishing village of Beer in Devon, have survived on the outside surface of the International Space Station for 553 days. The bacteria, known as OU-20, resemble cyanobacteria called Gloeocapsa.

The survival of so many of the bacteria in such a hostile environment with no oxygen adds weight to the hypothesis that microbes carried in meteors and meteorites could seed life on other planets or moons.

The Panspermia Theory hasn't been proved yet but Stephen Hawking thinks it's a possibility.

Ruminations on other worlds - Absent Hawking still shares views on alien life at Origins Symposium

Hawking also talked about what humans may find when venturing into space, such as the possibility of alien life through the theory of panspermia, which says that life in the form of DNA particles can be transmitted through space to habitable places.

“Life could spread from planet to planet or from stellar system to stellar system, carried on meteors,” he said.

If this is true it means that life, even if only in the form of DNA particles, has been travelling around the universe long before humans invented spacecraft and it will continue to travel even if we become extinct.