Life after death? Can't imagine my consciousness being gone, but, can't imagine it to live on without my functioning body either. It's beyond my imagination either way. And that is OK. What happens after death makes no difference for my life now. So, I'll focus on that. Do think people live on in their surroundings though. Not alone in active memory, also in tiny habits and such.
Mediums, leaving the verdict out on that. Have seen weird things, someone calling the name of people getting an accident. The poor kiddo was spot on all the time. And a neighbour turning white, telling her daughter that her dad had died. Indeed, that very moment her husband had a heart-attack and planted his car into a sturdy oak tree, miles away. A friend telling me that on holidays she needed to call home, because she was sure grandma had died. (unexpected death) And, she was right. That's not about talking with the dead though.
Aliens, very likely, somewhere in the giant space outside this globe. Could be they are no bigger than microbes, but, there probably is some life somewhere outside our planet.