Final answer:
Within our solar system, Mars, Europa, Enceladus, and Titan have characteristics that might support life, such as liquid water and organic chemistry. Exoplanets in habitable zones are also studied for biomarkers indicating potential life, although we mainly rely on remote sensing techniques like the detection of specific atmospheric gases to infer the presence of life.
Step-by-step explanation:
The search for extraterrestrial life within our solar system offers a few noteworthy targets. Mars, once warmer and wetter, may hold evidence of ancient life, and could still have liquid water beneath its surface which could perhaps support life today.
Jupiter's moon Europa, with its icy crust, is thought to hide an ocean that might support biological life, heated by tidal forces which could create an energy source, similar to hydrothermal vents on Earth's ocean floor. Saturn's moon Enceladus is intriguing because it also appears to have a subsurface ocean and has been observed to have geysers ejecting water vapor and organic molecules, indicating potential hydrothermal activity underneath its icy shell.
Titan, another moon of Saturn, shares a nitrogen-dominated atmosphere and has complex organic chemistry, suggesting another, albeit different, avenue for habitability. Moreover, studying exoplanets in the habitable zone of their stars is also crucial, where the conditions might allow liquid water and by extension, potentially life as we understand it. Instruments and missions designed to identify biomarkers such as specific gases or other compounds in exoplanet atmospheres could offer evidence of biological processes at play.
The complete question is: Which of these satellites might have some possibility of supporting life? Why? is: