In science we watched a video that on mars, there's methane gas. And to have methane gas you need life, because let's say that a cow eats grass and it becomes waste. The gas from the waste is methane. And scientist are trying to decide wether or not there is life. Idk if this makes sense but I just wrote down what I heard in the video. :p
We are alone in this universe but in other universes there is life, if we wanted to travel to the other universe it would be impossible, just think of the empire state building see how fast it was to think of it, now if went at that speed for a hundred years we still wouldn't make it to the other universe.