KN,
Yeah, by getting to them I mean getting to them in a timely manner. As it is, it take a long time indeed. We'd have to build a ship that could sustain us for the 7-10 years it would take to get there, keep us alive, and get us back. Or, keep us alive for long enough to figure out a way to build a colony.
I do not think it would take s 7-ten years to get there at present technology. We can get to mars within ten months, We can get to the asteroid belt within two years. I think we can get to the moons of Jupiter within 4 years. We have the technology that keeps humans alive on the space station for a extended period of time it would not be hard to turn that into space exploration.
Model based on hydrothermal sources evaluate possibility of life on Jupiter's icy moon. Scientists compare primitive Earth scenario with satellite Europa's conditions; the Jupiterian moon could host microorganisms at the bottom of a huge warm ocean located underneath its frozen crust. Source 6y.
On Jupiter's moon Europa, 'chaos terrains' could be shuttling oxygen to ocean. Researchers have built the world's first physics-based computer simulation of oxygen transport on Europa, finding that it's possible for oxygen to drain through the moon's icy shell and into its ocean of liquid water -- where it could potentially help sustain alien life -- by hitching a ride on salt water under the moon's 'chaos terrains.' The results show that not only is the transport possible, but that the amount of oxygen brought into Europa's ocean could be on a par with the quantity of oxygen in Earth's oceans today. Source 8w.