I was smoking a j on a sunny day thinking about how nothing would be here without the sun no life just nothing. There's so many suns and galaxies in the universe so that's why lots of people assume that there could be life on other planets. I know that you have to consider other things like oxygen and the distance of the planet but for the most part the sun is really what makes life. So basically how I see it sun = the creator of life. And who knows maybe the other life in our universe doesnt even need oxygen? maybe not even a sun lol. Suns could be left over energy from our universes creation. Idk I'm really high and I'm no expert on this stuff but I'm taking my knowledge on this from what i remember when i was in high school.
Yes, this is something I though of also, what if there are lifeforms which arent carbon based. Perhaps, oxygen based, or nitrogen based.