Would extraterrestrial life, if it exists, be similar to life on Earth?
Not necessarily, because environmental conditions beyond our planet could be vastly different. Factors such as temperature, chemical composition, atmospheric pressure, and the presence of solvents are not necessarily the same as those we have here. For example, Saturn's moon Titan has lakes and oceans of liquid methane instead of water, which raises the possibility of life based on a chemistry completely different from Earth's biochemistry.
As for the gas giants like Jupiter and Neptune, they lack a solid surface and have extremely harsh conditions deep within them (incredible pressure and temperature), making the existence of life as we know it virtually impossible.
However, some scientists suggest that the upper layers of their atmospheres, where conditions are more moderate, might harbor microscopic life or even "floating" organisms that drift within the dense clouds.
Likewise, there may be life forms that do not rely on photosynthesis or respiration as on Earth, but rather on alternative chemical reactions such as methanogenesis or other processes we have yet to discover.
This possibility is supported by what we observe on Earth itself: microorganisms exist in the deep ocean near hydrothermal vents or in highly acidic environments, living on unconventional energy sources.
This reinforces the idea that life may take forms we cannot currently imagine. While these ideas are still hypothetical and partly rooted in science fiction, advances in astrobiology and the study of planets and moons through telescopes and space probes may soon lead us to discoveries that reveal new ways life could arise in strange and unfamiliar environments.