Space

Yep.

But honestly to expect much else is unrealistic. At least in modern times.

The more we fail to find evidence of past life on mars. The more likely the things we look at are not oing to be a sign.

Unfortunately it is the only planet we have current exploration on.

Well other then earth. And we long since prooved no intelligent life there.

We do have a couple of moons that hold some promise. Hopefully we will launch robotic exploration there within my lifetime.

Unfortunately science funding for such exploration is getting harder each year.