I've devoured loads of SF books in my youth, initially space operas, then more advanced stuff. I love SF, I love Men in Black and Avatar and Alien and the Terminator series and so on.
Yet, science tells us that travelling to our neighbours is kind of difficult. Do wormholes really exist? Has anybody managed to use them, if they exist?
My best bet for accessible life outside Earth is Jupiter: in its atmosphere there is a band about 45km thick, in which the temperatures correspond to those that make life possible on Earth. All kinds of interesting substances, such as water, ammonia, H2S, phosphine and others, cavort in this band.
The volume of this band corresponds to a good 16,000 times that of all terrestrial oceans combined. If there is life outside the Earth in our solar system, it is there. However, it would be life forms that a) float in the atmosphere and b) have never seen the stars, or the Sun. They might be very intelligent, who knows, but without knowing that there is a sun, and that there other planets, why should they develop space travel?