3 Places with possible Alien life

I'm going to talk about some places in the solar sistem where Alien life could live
I have decided to make a short list explaining how life could live there and if it's possible to visit them, also I will give some extra information about this places.

1 EUROPA

Europa is the smallest of the four Galilean moons that orbite Jupiter, it's a little bit smaller than earth's moon, it is said that below it's large miles of ice covering the surface of the moon there's a huge mass of water where there's more liquid water than in all of Earth's oceans.
It has the smoothest surface of any object in the solar sistem, so you could slip miles without stopping because there's almost no friction.
Although having a large quantity of water, if you went below the surface it would be completely dark so photosynthesis wouldn't work. Life should find an alternative way of getting energy, maybe geothermal heat or other ways.
The distance between Europe and the earth is 628.300.000 km or 390.406.771 miles, so the fastest spacecraft would need to travel 162 days to reach it, so it could be possible to visit it

2 TITAN

Titan is Saturn's largest moon,it's larger than the smallest planet Mercury, also it is the only place known in our solar system that has liquid lakes.
It has a dense atmosphere which would create a suitable atmospheric pressure apropiate for life.
It is primarily composed of water ice and rocky materiall, and it's temperatures are mostly gelid (minus 290 Fahrenheit, or minus 179 Celsius), although this temperature and it's continious hydrocarbon rain could difficult the development of life it has a chemistry enterprise which could favor the development of simple life forms.
It is further than Europe so it would be more difficult to visit this moon to see if there are any life forms and make a big discovery, probably one of the biggest of humanity.

3 MARS

The second-smallest planet in the Solar System, after Mercury, it has thin atmosphere, craters of the Moon and the valleys, deserts, and polar ice caps like earth.
Mars can easily be seen from Earth with the naked eye so it has inspired a lot of stories about life in Mars, a topic that has been discussed for centuries, an now it seems there used to be liquid water when it had a bigger atmosphere and the temperatures where suitable for that. Since water is the base of life it seems possible that mars had life in the past but now it's probably gone.
Mars is close to the earth so it is the easiest planet with possible life to explore, and maybe in the future we may even colonize this planet to help humanity survive because humans would be in different places of the universe making it harder that a disastrous event happens.