It's a wonderful cosmos
There might be no liquid water on Mars, nor inside it, nor in its past, there might be no liquid water anywhere else but Earth in the solar system, our planet might be the only place with life the way we know it, in our galaxy.....
So what?
Science enables us to discover so many things!! Even if it's all facts with no meaning.
We know we exist because ancient stars ceased to exist, even while we admire and get inspired by those that were alive for their light to reach us now.
It's a wonderful cosmos....