Nasa has not reached deep space. With our current technology it would take about 500 years for a probe from earth to reach the nearest star 4 light years away. We don't know how to make a probe that would last that long. We have only been able to explore the major plants in our solar system. Most are gas giants with no solid surface and very cold temperatures. The others are either too hot or have no atmosphere.
But that said there were two surprising finds. Jupiters mood
Europa is covered in ice but appears to have a liquid ocean under the ice. Saturns moon
Enceledus is also covered in ice but it has geysers of salt water jetting out from some cracks in the ice. Both have cores that are being heated by tidal forcees and may have molten cores. They could have aquatic life.
Right now Nasa is building a probe to orbit Europa to confirm the pressence of an ocean. Getting a probe through the icy surface however will be difficult. The ice could be 15 to 25 miles thick. The ocean may be 100 miles deep. The thickest ice on earth is about 3 miles thick and the deepest place in the Pacific ocean is 6.7 miles deep.
Given that our solar system has three places with a water ocean there is a very good probabilitytht there is life somewhere else. But intelligent life with technology to explore space might rare. with Most places however might be just limited ro bacterial, plant, or aquatic life.
